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#1
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Amplifier power
tony sayer wrote: I reckon you'd be well pushed to improve of the Audiolab excellent amplifier even at 20 years old  )..You must be living in a very weird world then. Its design is utterly 'agricultural' by today's standards. It's barely any better than a decent semiconductor manufacturer's application note of that era. Frankly it's a joke. Plus any one you can find will need total re-capping of the electrolytics. Graham (pro-audio designer with 37 yrs experience) |
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#2
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Amplifier power
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#3
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Amplifier power
tony sayer wrote: Eeyore scribeth thus tony sayer wrote: I reckon you'd be well pushed to improve of the Audiolab excellent amplifier even at 20 years old )..You must be living in a very weird world then. Its design is utterly 'agricultural' by today's standards. It's barely any better than a decent semiconductor manufacturer's application note of that era. Frankly it's a joke. Plus any one you can find will need total re-capping of the electrolytics. Graham (pro-audio designer with 37 yrs experience) Bet you'd be hard pressed to tell one apart in a listening test!.. No perhaps not.. their prolly too neutral for your linking;!... If you want neutral you need one of my ultra-performance mosfet designs. The actual 'amp block' has a THD+N of 0.0008% @ 1 kHz (SINAD -103dB) measured on an AP with a residual THD+N of 0.0007% ! The 'back calculates' to a true THD of 0.0004% (SINAD -108dB). The response is VERY flat too. About -0.2dB @ 10 Hz and 20kHz IIRC. Oh and I designed it about 19 years ago. Sadly, the figure is degraded by the op-amp front end (5532s) ! But I could replace these with LME49720s instead. Graham |
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#4
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Amplifier power
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#5
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Amplifier power
tony sayer wrote: Eeyore scribeth thus tony sayer wrote: Eeyore scribeth thus tony sayer wrote: I reckon you'd be well pushed to improve of the Audiolab excellent amplifier even at 20 years old )..You must be living in a very weird world then. Its design is utterly 'agricultural' by today's standards. It's barely any better than a decent semiconductor manufacturer's application note of that era. Frankly it's a joke. Plus any one you can find will need total re-capping of the electrolytics. Graham (pro-audio designer with 37 yrs experience) Bet you'd be hard pressed to tell one apart in a listening test!.. No perhaps not.. their prolly too neutral for your linking;!... If you want neutral you need one of my ultra-performance mosfet designs. The actual'amp block' has a THD+N of 0.0008% @ 1 kHz (SINAD -103dB) measured on an AP with a residual THD+N of 0.0007% ! That 'back calculates' to a true THD of 0.0004% (SINAD -108dB). The response is VERY flat too. About -0.2dB @ 10 Hz and 20kHz IIRC. Oh and I designed it about 19 years ago. Sadly, the figure is degraded by the op-amp front end (5532s) ! But I could replace these with LME49720s instead. Humm... I Wonder how may pro recording bits of gear are around with 5532's  ..Just about most of it in current use. Did you check the spec of the LME49720 ? http://www.national.com/pf/LM/LME49720.html They had to devise a special method to measure the THD without the noise dominating. They're not even that shockingly expensive. Graham |
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#7
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Amplifier power
On Tue, 14 Oct 2008 21:06:34 +0100, tony sayer
wrote: In article , Eeyore rabbitsfriendsandrel scribeth thus tony sayer wrote: Eeyore scribeth thus tony sayer wrote: Eeyore scribeth thus tony sayer wrote: I reckon you'd be well pushed to improve of the Audiolab excellent amplifier even at 20 years old )..You must be living in a very weird world then. Its design is utterly 'agricultural' by today's standards. It's barely any better than a decent semiconductor manufacturer's application note of that era. Frankly it's a joke. Plus any one you can find will need total re-capping of the electrolytics. Graham (pro-audio designer with 37 yrs experience) Bet you'd be hard pressed to tell one apart in a listening test!.. No perhaps not.. their prolly too neutral for your linking;!... If you want neutral you need one of my ultra-performance mosfet designs. The actual'amp block' has a THD+N of 0.0008% @ 1 kHz (SINAD -103dB) measured on an AP with a residual THD+N of 0.0007% ! That 'back calculates' to a true THD of 0.0004% (SINAD -108dB). The response is VERY flat too. About -0.2dB @ 10 Hz and 20kHz IIRC. Oh and I designed it about 19 years ago. Sadly, the figure is degraded by the op-amp front end (5532s) ! But I could replace these with LME49720s instead. Humm... I Wonder how may pro recording bits of gear are around with 5532's ..Just about most of it in current use. Are they at all similar to 5534's? Sure I used them in a phono pre-amp in the 80's, copied out of a R. A. Penfold book. Marky P. |
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#8
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Amplifier power
In article , Marky P
scribeth thus On Tue, 14 Oct 2008 21:06:34 +0100, tony sayer wrote: In article , Eeyore rabbitsfriendsandrel scribeth thus tony sayer wrote: Eeyore scribeth thus tony sayer wrote: Eeyore scribeth thus tony sayer wrote: I reckon you'd be well pushed to improve of the Audiolab excellent amplifier even at 20 years old )..You must be living in a very weird world then. Its design is utterly 'agricultural' by today's standards. It's barely any better than a decent semiconductor manufacturer's application note of that era. Frankly it's a joke. Plus any one you can find will need total re-capping of the electrolytics. Graham (pro-audio designer with 37 yrs experience) Bet you'd be hard pressed to tell one apart in a listening test!.. No perhaps not.. their prolly too neutral for your linking;!... If you want neutral you need one of my ultra-performance mosfet designs. The actual'amp block' has a THD+N of 0.0008% @ 1 kHz (SINAD -103dB) measured on an AP with a residual THD+N of 0.0007% ! That 'back calculates' to a true THD of 0.0004% (SINAD -108dB). The response is VERY flat too. About -0.2dB @ 10 Hz and 20kHz IIRC. Oh and I designed it about 19 years ago. Sadly, the figure is degraded by the op-amp front end (5532s) ! But I could replace these with LME49720s instead. Humm... I Wonder how may pro recording bits of gear are around with 5532's ..Just about most of it in current use. Are they at all similar to 5534's? Sure I used them in a phono pre-amp in the 80's, copied out of a R. A. Penfold book. Marky P. Ones a single and ones a dual i.e. two Op amps in the one package and apart form some silly buggers usage their excellent chips for most all applications ...-- Tony Sayer |
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#9
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Amplifier power
tony sayer wrote: Eeyore scribeth thus Did you check the spec of the LME49720 ? http://www.national.com/pf/LM/LME49720.html They had to devise a special method to measure the THD without the noise dominating. They're not even that shockingly expensive. Shockingly enough in small quantities;!... From the likes of Farnell maybe £4 seems a lot but compare that to a $400 wooden volume control knob ! http://uk.farnell.com/1367613/semico...questid=131459 That's only £2 per divine op-amp ! Wonder what Doc Martin would have to say;?... You lost me Graham |
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#10
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Amplifier power
Marky P wrote: tony sayer wrote: I Wonder how may pro recording bits of gear are around with 5532's ..Just about most of it in current use. Are they at all similar to 5534's? Sure I used them in a phono pre-amp in the 80's, copied out of a R. A. Penfold book. Yes, they're the dual version and about 3dB noisier although not quite sure why. Graham |
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#11
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Amplifier power
"Eeyore" wrote ...
tony sayer wrote: Eeyore scribeth thus Did you check the spec of the LME49720 ? http://www.national.com/pf/LM/LME49720.html They had to devise a special method to measure the THD without the noise dominating. They're not even that shockingly expensive. Shockingly enough in small quantities;!... From the likes of Farnell maybe £4 seems a lot but compare that to a $400 wooden volume control knob ! http://uk.farnell.com/1367613/semico...questid=131459 That's only £2 per divine op-amp ! I can't remember the last time (or ever?) I've seen a chip that was concurrently available in a package as new as SOIC and still in an antique metal-can, 8-pin TO-99! Is there some sort of continuing demand for those old metal cans? Military? |
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#12
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Amplifier power
Richard Crowley wrote: "Eeyore" wrote ... tony sayer wrote: Eeyore scribeth thus Did you check the spec of the LME49720 ? http://www.national.com/pf/LM/LME49720.html They had to devise a special method to measure the THD without the noise dominating. They're not even that shockingly expensive. Shockingly enough in small quantities;!... From the likes of Farnell maybe £4 seems a lot but compare that to a $400 wooden volume control knob ! http://uk.farnell.com/1367613/semico...questid=131459 That's only £2 per divine op-amp ! I can't remember the last time (or ever?) I've seen a chip that was concurrently available in a package as new as SOIC and still in an antique metal-can, 8-pin TO-99! Is there some sort of continuing demand for those old metal cans? Military? Audiophools ? Graham |
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#13
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Amplifier power
In article , Eeyore
wrote: Marky P wrote: tony sayer wrote: I Wonder how may pro recording bits of gear are around with 5532's ..Just about most of it in current use. Are they at all similar to 5534's? Sure I used them in a phono pre-amp in the 80's, copied out of a R. A. Penfold book. Yes, they're the dual version and about 3dB noisier although not quite sure why. Not knowing why, my immediate suspicion was substrate noise caused by having two lots of bias currents. But that is just a spur of the moment guess. :-) FWIW I came to prefer the HA12017 as a general purpose audio op-amp. But I appreciate this is quite a weird choice. Slainte, Jim -- Change 'noise' to 'jcgl' if you wish to email me. Electronics http://www.st-and.ac.uk/~www_pa/Scot...o/electron.htm Armstrong Audio http://www.audiomisc.co.uk/Armstrong/armstrong.html Audio Misc http://www.audiomisc.co.uk/index.html |
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#14
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Amplifier power
In article , Eeyore rabbitsfriendsandrel
scribeth thus tony sayer wrote: Eeyore scribeth thus Did you check the spec of the LME49720 ? http://www.national.com/pf/LM/LME49720.html They had to devise a special method to measure the THD without the noise dominating. They're not even that shockingly expensive. Shockingly enough in small quantities;!... From the likes of Farnell maybe £4 seems a lot but compare that to a $400 wooden volume control knob ! http://uk.farnell.com/1367613/semico...roduct.us0?sku =national-semiconductor-lme49720ma-nopb&_requestid=131459 That's only £2 per divine op-amp ! What were those $150 ones for then?.. Wonder what Doc Martin would have to say;?... You lost me Him of Neve descent, didn't you work together once?.. Graham -- Tony Sayer |
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#15
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Amplifier power
"tony sayer" wrote in message
I Wonder how may pro recording bits of gear are around with 5532's ..Tons and tons. But 5532s used right are really very good pieces, even by modern standards. And for the price...! The scarier part is how may pro recording bits of gear are around with TL074s, or even NJM4558s in the signal path. |
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#16
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Amplifier power
tony sayer wrote: Eeyore scribeth thus tony sayer wrote: Eeyore scribeth thus Did you check the spec of the LME49720 ? http://www.national.com/pf/LM/LME49720.html They had to devise a special method to measure the THD without the noise dominating. They're not even that shockingly expensive. Shockingly enough in small quantities;!... From the likes of Farnell maybe £4 seems a lot but compare that to a $400 wooden volume control knob ! http://uk.farnell.com/1367613/semico...roduct.us0?sku =national-semiconductor-lme49720ma-nopb&_requestid=131459 That's only £2 per divine op-amp ! What were those $150 ones for then?.. Evaluation boards I think ? Wonder what Doc Martin would have to say;?... You lost me Him of Neve descent, didn't you work together once?.. DOC ? Martin ? I knew a Martin forget his surname who was in R&D. Not Martin (M.H) (Hartley) Jones PhD you mean ? He'd left by the time I arrived. I later did some work for him at Kelvin Hughes radar. Lovely chap. I still talk to him very occasionally. In fact I was just on the point of asking if he'd be happy to be a reference on my CV ! http://www.ibd-uk.com/members/jones-martin.htm Graham |
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#17
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Amplifier power
Jim Lesurf wrote: Eeyore wrote: Marky P wrote: tony sayer wrote: I Wonder how may pro recording bits of gear are around with 5532's ..Just about most of it in current use. Are they at all similar to 5534's? Sure I used them in a phono pre-amp in the 80's, copied out of a R. A. Penfold book. Yes, they're the dual version and about 3dB noisier although not quite sure why. Not knowing why, my immediate suspicion was substrate noise caused by having two lots of bias currents. But that is just a spur of the moment guess. :-) FWIW I came to prefer the HA12017 as a general purpose audio op-amp. But I appreciate this is quite a weird choice. Weird isn't the word for it. ;~) Ever come across NJM 4560s, 4580s or 2068s ? From JRC/NJR (New Japan Radio Company). Not at all bad and the 4560 doesn't burn as much current but is a bit noiser than 5532s but still around TL07x levels. Btw - don't EVER confuse the NJM4562 with the LM4562. Someone dropped a minor clanger there and I think it was National, why is why the same device (apparently) turns up as the LME49720 as well. Graham |
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#18
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Amplifier power
Arny Krueger wrote: "tony sayer" wrote I Wonder how may pro recording bits of gear are around with 5532's ..Tons and tons. But 5532s used right are really very good pieces, even by modern standards. And for the price...! And to think they were around in the 1970s too ! And Philips / Signetics initially only thought they were going to sell it into the telecoms market because of the 600 ohm drive ! Philips = NE5532 Signetics ( Philips N.A.) = SE5532 btw. The scarier part is how may pro recording bits of gear are around with TL074s, or even NJM4558s in the signal path. TL07Xs are still ok for some stuff, especially because of the jfet front end but 4558s ? YUCK ! Graham |
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#19
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Amplifier power
In article , Eeyore rabbitsfriendsandrel
scribeth thus tony sayer wrote: Eeyore scribeth thus tony sayer wrote: Eeyore scribeth thus Did you check the spec of the LME49720 ? http://www.national.com/pf/LM/LME49720.html They had to devise a special method to measure the THD without the noise dominating. They're not even that shockingly expensive. Shockingly enough in small quantities;!... From the likes of Farnell maybe £4 seems a lot but compare that to a $400 wooden volume control knob ! http://uk.farnell.com/1367613/semico...rs-integrated- circuits/product.us0?sku =national-semiconductor-lme49720ma-nopb&_requestid=131459 That's only £2 per divine op-amp ! What were those $150 ones for then?.. Evaluation boards I think ? Wonder what Doc Martin would have to say;?... You lost me Him of Neve descent, didn't you work together once?.. DOC ? Martin ? I knew a Martin forget his surname who was in R&D. Not Martin (M.H) (Hartley) Jones PhD you mean ? He'd left by the time I arrived. I later did some work for him at Kelvin Hughes radar. Lovely chap. I still talk to him very occasionally. In fact I was just on the point of asking if he'd be happy to be a reference on my CV ! http://www.ibd-uk.com/members/jones-martin.htm Graham Yes thats the one, my next door neighbour. I thought he'd be retiring by now but he's as busy as ever ...I'd expect he'd give U a reference ..-- Tony Sayer |
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#20
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Amplifier power
On Wed, 15 Oct 2008 19:06:26 +0100, Eeyore
wrote: Arny Krueger wrote: "tony sayer" wrote I Wonder how may pro recording bits of gear are around with 5532's ..Tons and tons. But 5532s used right are really very good pieces, even by modern standards. And for the price...! And to think they were around in the 1970s too ! And Philips / Signetics initially only thought they were going to sell it into the telecoms market because of the 600 ohm drive ! Philips = NE5532 Signetics ( Philips N.A.) = SE5532 btw. The scarier part is how may pro recording bits of gear are around with TL074s, or even NJM4558s in the signal path. TL07Xs are still ok for some stuff, especially because of the jfet front end but 4558s ? YUCK ! Graham Well, since we're on the subject of IC's, I've dug out my little drawer of IC's left over from my 80's electronics days :-) Can't remember if any of these are op amps, but here are the numbers: LM382N LM380N LM3482A LM741 (pretty sure this is an op amp) M5K4164ANP (ain't a bloody clue what this is) TIP31A ZTX300 (a little 3 pin thing) ZN414 (this is an FM radio on a 3 pin chip) MJE2955 NE555P (loads of these buggers, I know they are timers). Sorry for hijacking this post ;-) Marky P. |
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#21
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Amplifier power
tony sayer wrote: Eeyore scribeth thus tony sayer wrote: Eeyore scribeth thus tony sayer wrote: Eeyore scribeth thus Did you check the spec of the LME49720 ? http://www.national.com/pf/LM/LME49720.html They had to devise a special method to measure the THD without the noise dominating. They're not even that shockingly expensive. Shockingly enough in small quantities;!... From the likes of Farnell maybe £4 seems a lot but compare that to a $400 woodenvolume control knob ! http://uk.farnell.com/1367613/semico...rs-integrated- circuits/product.us0?sku =national-semiconductor-lme49720ma-nopb&_requestid=131459 That's only £2 per divine op-amp ! What were those $150 ones for then?.. Evaluation boards I think ? Wonder what Doc Martin would have to say;?... You lost me Him of Neve descent, didn't you work together once?.. DOC ? Martin ? I knew a Martin forget his surname who was in R&D. Not Martin (M.H) (Hartley) Jones PhD you mean ? He'd left by the time I arrived. I later did some work for him at Kelvin Hughes radar. Lovely chap. I still talk to him very occasionally. In fact I was just on the point of asking if he'd be happy to be a reference on my CV ! http://www.ibd-uk.com/members/jones-martin.htm Yes thats the one, my next door neighbour. I thought he'd be retiring by now but he's as busy as ever ...I don't think he wants to stop. And your neighbour too ! What a small world it is. I'd expect he'd give U a reference ..I damn well hope so after I saved a project there ! Do you see him often ? Say Graham Stevenson sends his regards and let's see if it clicks. Graham |
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#22
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Amplifier power
Marky P wrote: Eeyore wrote: Arny Krueger wrote: "tony sayer" wrote I Wonder how may pro recording bits of gear are around with 5532's ..Tons and tons. But 5532s used right are really very good pieces, even by modern standards. And for the price...! And to think they were around in the 1970s too ! And Philips / Signetics initially only thought they were going to sell it into the telecoms market because of the 600 ohm drive ! Philips = NE5532 Signetics ( Philips N.A.) = SE5532 btw. The scarier part is how may pro recording bits of gear are around with TL074s, or even NJM4558s in the signal path. TL07Xs are still ok for some stuff, especially because of the jfet front end but 4558s ? YUCK ! Graham Well, since we're on the subject of IC's, I've dug out my little drawer of IC's left over from my 80's electronics days :-) Can't remember if any of these are op amps, but here are the numbers: LM382N LM380N Maybe a crappy low power audio amp. LM3482A No idea about the above. LM741 (pretty sure this is an op amp) Pretty lousy one too by today's standards. M5K4164ANP (ain't a bloody clue what this is) Sounds like a Mostek part number. Does it have lots of legs ? TIP31A TO-220 medium power transistor. Forget which polarity. ZTX300 (a little 3 pin thing) Ferranti (now Zetex) small signal npn ? transistor. Their version (E-line) of TO-92. ZN414 (this is an FM radio on a 3 pin chip) For a TRF design. MJE2955 PNP complement of the 2N3055. TO-3 115W 60V device. NE555P (loads of these buggers, I know they are timers). They are. Single timers. Graham |
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#23
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Amplifier power
In article , Eeyore rabbitsfriendsandrel
scribeth thus tony sayer wrote: Eeyore scribeth thus tony sayer wrote: Eeyore scribeth thus tony sayer wrote: Eeyore scribeth thus Did you check the spec of the LME49720 ? http://www.national.com/pf/LM/LME49720.html They had to devise a special method to measure the THD without the noise dominating. They're not even that shockingly expensive. Shockingly enough in small quantities;!... From the likes of Farnell maybe £4 seems a lot but compare that to a $400 woodenvolume control knob ! http://uk.farnell.com/1367613/semico...rs-integrated- circuits/product.us0?sku =national-semiconductor-lme49720ma-nopb&_requestid=131459 That's only £2 per divine op-amp ! What were those $150 ones for then?.. Evaluation boards I think ? Wonder what Doc Martin would have to say;?... You lost me Him of Neve descent, didn't you work together once?.. DOC ? Martin ? I knew a Martin forget his surname who was in R&D. Not Martin (M.H) (Hartley) Jones PhD you mean ? He'd left by the time I arrived. I later did some work for him at Kelvin Hughes radar. Lovely chap. I still talk to him very occasionally. In fact I was just on the point of asking if he'd be happy to be a reference on my CV ! http://www.ibd-uk.com/members/jones-martin.htm Yes thats the one, my next door neighbour. I thought he'd be retiring by now but he's as busy as ever ...I don't think he wants to stop. And your neighbour too ! What a small world it is. I'd expect he'd give U a reference ..I damn well hope so after I saved a project there ! Do you see him often ? Say Graham Stevenson sends his regards and let's see if it clicks. Graham M8!, he's out running around 5 am 'ish and off to work before I fall downstairs and amble out to my office;!.. And gawd knows when he comes home either!, but if I do I will ..-- Tony Sayer |
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#24
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Amplifier power
On Wed, 15 Oct 2008 23:11:16 +0100, Eeyore
wrote: Marky P wrote: Eeyore wrote: Arny Krueger wrote: "tony sayer" wrote I Wonder how may pro recording bits of gear are around with 5532's ..Tons and tons. But 5532s used right are really very good pieces, even by modern standards. And for the price...! And to think they were around in the 1970s too ! And Philips / Signetics initially only thought they were going to sell it into the telecoms market because of the 600 ohm drive ! Philips = NE5532 Signetics ( Philips N.A.) = SE5532 btw. The scarier part is how may pro recording bits of gear are around with TL074s, or even NJM4558s in the signal path. TL07Xs are still ok for some stuff, especially because of the jfet front end but 4558s ? YUCK ! Graham Well, since we're on the subject of IC's, I've dug out my little drawer of IC's left over from my 80's electronics days :-) Can't remember if any of these are op amps, but here are the numbers: LM382N LM380N Maybe a crappy low power audio amp. LM3482A No idea about the above. LM741 (pretty sure this is an op amp) Pretty lousy one too by today's standards. M5K4164ANP (ain't a bloody clue what this is) Sounds like a Mostek part number. Does it have lots of legs ? Yep. 16. TIP31A TO-220 medium power transistor. Forget which polarity. ZTX300 (a little 3 pin thing) Ferranti (now Zetex) small signal npn ? transistor. Their version (E-line) of TO-92. ZN414 (this is an FM radio on a 3 pin chip) For a TRF design. MJE2955 PNP complement of the 2N3055. TO-3 115W 60V device. NE555P (loads of these buggers, I know they are timers). They are. Single timers. Graham Thanks for that! Now I've gotta decide whether to bin 'em or keep 'em for nostalga's sake :-) Marky P. |
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#25
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Amplifier power
Marky P wrote: Eeyore wrote: Marky P wrote: M5K4164ANP (ain't a bloody clue what this is) Sounds like a Mostek part number. Does it have lots of legs ? Yep. 16. Ah ! 4164. That's ancient DRAM 64k x 1 IIRC. Graham |
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#26
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Amplifier power
Marky P wrote: Eeyore wrote: Marky P wrote: ZN414 (this is an FM radio on a 3 pin chip) For a TRF design. IIRC I recall someone once asking for one of those sci.electronics.components. You could offer them on there rather than junk them. Graham |
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#27
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Amplifier power
On Thu, 16 Oct 2008 14:00:02 +0100, Eeyore
wrote: Marky P wrote: Eeyore wrote: Marky P wrote: ZN414 (this is an FM radio on a 3 pin chip) For a TRF design. IIRC I recall someone once asking for one of those sci.electronics.components. You could offer them on there rather than junk them. Graham FS: All the above mentioned IC's. Offers welcome :-) Marky P. |
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#28
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Amplifier power
"Marky P" wrote in
message Can't remember if any of these are op amps, but here are the numbers: LM382N Low noise dual preamp. http://pdf1.alldatasheet.co.kr/datas...SC/LM382N.html LM380N 2.5 watt power amp http://www.national.com/pf/LM/LM380.html LM3482A Precision Current Gauge IC with Internal Zero Ohm Sense Element and PWM Output http://www.national.com/mpf/LM/LM3824.html LM741 (pretty sure this is an op amp) Yup and a real oldie. Slow and noisy, not to mention power hungry and a weak output for what it does. http://www.national.com/mpf/LM/LM741.html M5K4164ANP (ain't a bloody clue what this is) http://www.alldatasheet.com/view.jsp...ord=M5K4164ANP RAM chip. TIP31A Power transistor http://www.onsemi.com/pub_link/Collateral/TIP31A-D.PDF ZTX300 (a little 3 pin thing) NPN signal transistor http://www.datasheetcatalog.com/data...3/ZTX300.shtml ZN414 (this is an FM radio on a 3 pin chip) http://www.electronics-lab.com/projects/rf/008/ MJE2955 PNP complement to the MJE3055 which is a 2N3055 in a cheap plastic case. http://www.onsemi.com/PowerSolutions...do?id=MJE2955T BTW Marky, the trip down memory lane was fun for me, but have you ever heard of google? ;-) |
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#29
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Amplifier power
Marky P wrote:
ZN414 (this is an FM radio on a 3 pin chip) It is an AM radio. Martin |
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#30
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Amplifier power
Fleetie wrote: Marky P wrote: ZN414 (this is an FM radio on a 3 pin chip) It is an AM radio. True. Missed that. Graham |
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#31
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Amplifier power
On Thu, 16 Oct 2008 14:49:33 +0100, "Fleetie"
wrote: Marky P wrote: ZN414 (this is an FM radio on a 3 pin chip) It is an AM radio. Martin Is it? Wonder what the hell I bought that for then? Can't remember having any plans to build an AM radio? Marky P. |
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#32
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Amplifier power
"Arny Krueger" wrote in message ... BTW Marky, the trip down memory lane was fun for me, but have you ever heard of google? ;-) Obviously not, or he just prefers others to do it for him, and you were happy to oblige. MrT. |
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#33
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Amplifier power
"Arny Krueger" wrote in message ... "Marky P" wrote in message [...] LM741 (pretty sure this is an op amp) Yup and a real oldie. Slow and noisy, not to mention power hungry and a weak output for what it does. This was arguably the "breakthrough" IC op-amp. It was one of the first popular devices that was actually a monolithic design, and not a hybrid like some of the original Burr Brown modules. It was compensated for unity gain, which made it much too slow for anything but a buffer for audio work. It had a slew rate of 0.5 volts/microsecond. With a +/- 12 volt power supply, 6 kHz rail-to-rail was about it for non-slew rate limited signals. You could get 20KHz through it if you were content with about 4 volts peak. I think it had more applications in analog computing, integrators, low frequency function generators, servo controls, etc. |
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#34
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Amplifier power
"Marky P" wrote
On Thu, 16 Oct 2008 14:49:33 +0100, "Fleetie" wrote: Marky P wrote: ZN414 (this is an FM radio on a 3 pin chip) It is an AM radio. Martin Is it? Wonder what the hell I bought that for then? Can't remember having any plans to build an AM radio? I don't know, but it is AM. I had one and built a little radio from it when I was a teenager in the late 80s. Actually, I think mine was ZN414A, but I can't remember what the "A" designation indicated. Ah: Googling the two codes together gave just one hit: --- "For those who will doubtless ask, ZN414 has been discontinued. Some years [ago,] it was upgraded to ZN414A, which lowered noise, increased gain. But that, too has been supplanted by yet another chip that's still current, though the designation escapes me." --- Other chips-from-childhood: 555 (since before age 10) 741 4001, etc. 4017 - Racing LED patterns 4051 - analogue switch, IIRC. Used it to make a crude 8-channel-from-1 'scope add-on 4069 - Was this a hex inverter 40106 (IIRC) - Hex Schmitt inverter? TDA2030 LM1875 (IIRC) HY60 (module) And probably many others that I've forgotten! Martin |
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#35
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Amplifier power
On Fri, 17 Oct 2008 13:20:45 +1000, "Mr.T" MrT@home wrote:
"Arny Krueger" wrote in message ... BTW Marky, the trip down memory lane was fun for me, but have you ever heard of google? ;-) Obviously not, or he just prefers others to do it for him, and you were happy to oblige. MrT. Never thought of googling them actually. I'm a bit slow in that respect :-) Marky P. |
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#36
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Amplifier power
Chronic Philharmonic wrote: "Arny Krueger" wrote "Marky P" wrote LM741 (pretty sure this is an op amp) Yup and a real oldie. Slow and noisy, not to mention power hungry and a weak output for what it does. This was arguably the "breakthrough" IC op-amp. It was one of the first popular devices that was actually a monolithic design, and not a hybrid like some of the original Burr Brown modules. It was compensated for unity gain, which made it much too slow for anything but a buffer for audio work. It had a slew rate of 0.5 volts/microsecond. With a +/- 12 volt power supply, 6 kHz rail-to-rail was about it for non-slew rate limited signals. You could get 20KHz through it if you were content with about 4 volts peak. I think it had more applications in analog computing, integrators, low frequency function generators, servo controls, etc. True but it DID get used in audio. Its companion, the 748 was uncompensated internally (like the 5534 vs the 5532) and always seemed less noisy to me, so I used quite a few of those. Graham |
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#37
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Amplifier power
In article , Eeyore wrote:
Chronic Philharmonic wrote: "Arny Krueger" wrote "Marky P" wrote LM741 (pretty sure this is an op amp) Yup and a real oldie. Slow and noisy, not to mention power hungry and a weak output for what it does. This was arguably the "breakthrough" IC op-amp. It was one of the first popular devices that was actually a monolithic design, and not a hybrid like some of the original Burr Brown modules. It was compensated for unity gain, which made it much too slow for anything but a buffer for audio work. It had a slew rate of 0.5 volts/microsecond. With a +/- 12 volt power supply, 6 kHz rail-to-rail was about it for non-slew rate limited signals. You could get 20KHz through it if you were content with about 4 volts peak. I think it had more applications in analog computing, integrators, low frequency function generators, servo controls, etc. True but it DID get used in audio. Its companion, the 748 was uncompensated internally (like the 5534 vs the 5532) and always seemed less noisy to me, so I used quite a few of those. The RC4136 was used in a lot of stuff. It had a faster slew rate, and I measured up to 1.8 v/us, and was called a quad 741. Weird pins too. greg |
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#38
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Amplifier power
"Eeyore" wrote in
message Chronic Philharmonic wrote: "Arny Krueger" wrote "Marky P" wrote LM741 (pretty sure this is an op amp) Yup and a real oldie. Slow and noisy, not to mention power hungry and a weak output for what it does. This was arguably the "breakthrough" IC op-amp. It was one of the first popular devices that was actually a monolithic design, and not a hybrid like some of the original Burr Brown modules. It was compensated for unity gain, which made it much too slow for anything but a buffer for audio work. It had a slew rate of 0.5 volts/microsecond. With a +/- 12 volt power supply, 6 kHz rail-to-rail was about it for non-slew rate limited signals. You could get 20KHz through it if you were content with about 4 volts peak. I think it had more applications in analog computing, integrators, low frequency function generators, servo controls, etc. True but it DID get used in audio. Its companion, the 748 was uncompensated internally (like the 5534 vs the 5532) and always seemed less noisy to me, so I used quite a few of those. The on-chip compensation cap for the 741 was a well-known source of noise. LM301s were another alternative once the market matured some more. I believe that the integrated preamp/crossover for the original Infinity Servo-Static system used 741s. As others have pointed out, their slew-rate limitations were not that bad if you were running them at usual consumer levels like 1.5 volts RMS. |
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#39
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Amplifier power
In article , "Arny Krueger" wrote:
"Eeyore" wrote in message Chronic Philharmonic wrote: "Arny Krueger" wrote "Marky P" wrote LM741 (pretty sure this is an op amp) Yup and a real oldie. Slow and noisy, not to mention power hungry and a weak output for what it does. This was arguably the "breakthrough" IC op-amp. It was one of the first popular devices that was actually a monolithic design, and not a hybrid like some of the original Burr Brown modules. It was compensated for unity gain, which made it much too slow for anything but a buffer for audio work. It had a slew rate of 0.5 volts/microsecond. With a +/- 12 volt power supply, 6 kHz rail-to-rail was about it for non-slew rate limited signals. You could get 20KHz through it if you were content with about 4 volts peak. I think it had more applications in analog computing, integrators, low frequency function generators, servo controls, etc. True but it DID get used in audio. Its companion, the 748 was uncompensated internally (like the 5534 vs the 5532) and always seemed less noisy to me, so I used quite a few of those. The on-chip compensation cap for the 741 was a well-known source of noise. LM301s were another alternative once the market matured some more. I believe that the integrated preamp/crossover for the original Infinity Servo-Static system used 741s. As others have pointed out, their slew-rate limitations were not that bad if you were running them at usual consumer levels like 1.5 volts RMS. The more recent NHT pro monitors used RC4136's in the active stages. greg |
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#40
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