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#1
Posted to rec.audio.tech
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Where to buy HQ pot meter and source selector switch
May be OT but I need an HQ pot meter for volume and
a source selector switch for my home build pre amplifier. For the selector switch, the more selections the better! Can anyone point me in a good direction? Thanks Edmund |
#2
Posted to rec.audio.tech
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Where to buy HQ pot meter and source selector switch
"Edmund" wrote in message
... May be OT but I need an HQ pot meter for volume and a source selector switch for my home build pre amplifier. For the selector switch, the more selections the better! Can anyone point me in a good direction? Thanks Edmund You might take a look at chip switches. I have used them for a few projects now. You can use as many as you want. They switch cleaner. http://focus.ti.com/lit/ds/symlink/cd4066b.pdf |
#3
Posted to rec.audio.tech
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Where to buy HQ pot meter and source selector switch
"jamesgangnc" wrote in message ... "Edmund" wrote in message ... May be OT but I need an HQ pot meter for volume and a source selector switch for my home build pre amplifier. For the selector switch, the more selections the better! Can anyone point me in a good direction? Thanks Edmund You might take a look at chip switches. I have used them for a few projects now. You can use as many as you want. They switch cleaner. http://focus.ti.com/lit/ds/symlink/cd4066b.pdf I built a number of passive pre-amps using ALPS conductive-plastic pots. Very quiet and smooth. As to switches, I used gold-plated toggle switches, a bit of an inconvenience as you had to switch a source off as well as on, but they were extremely reliable. The chip switches mentioned above will be good provided the voltage levels are suitable and you have a power supply available. S -- http://audiopages.googlepages.com |
#4
Posted to rec.audio.tech
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Where to buy HQ pot meter and source selector switch
Edmund wrote: May be OT but I need an HQ pot meter for volume and a source selector switch for my home build pre amplifier. For the selector switch, the more selections the better! Can anyone point me in a good direction? What country / state / county do you live in ? Graham |
#5
Posted to rec.audio.tech
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Where to buy HQ pot meter and source selector switch
jamesgangnc wrote: "Edmund" wrote May be OT but I need an HQ pot meter for volume and a source selector switch for my home build pre amplifier. For the selector switch, the more selections the better! Can anyone point me in a good direction? Thanks Edmund You might take a look at chip switches. I have used them for a few projects now. You can use as many as you want. They switch cleaner. http://focus.ti.com/lit/ds/symlink/cd4066b.pdf 4066s are shockingly bad. At least consider something half reasomable like a DG308 or 211. Or even discrete fets. Graham |
#6
Posted to rec.audio.tech
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Where to buy HQ pot meter and source selector switch
On Sat, 28 Jun 2008 17:59:22 +0100, Eeyore wrote:
Edmund wrote: May be OT but I need an HQ pot meter for volume and a source selector switch for my home build pre amplifier. For the selector switch, the more selections the better! Can anyone point me in a good direction? What country / state / county do you live in ? Graham Netherlands Edmund |
#7
Posted to rec.audio.tech
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Where to buy HQ pot meter and source selector switch
"Eeyore" wrote in message
... jamesgangnc wrote: "Edmund" wrote May be OT but I need an HQ pot meter for volume and a source selector switch for my home build pre amplifier. For the selector switch, the more selections the better! Can anyone point me in a good direction? Thanks Edmund You might take a look at chip switches. I have used them for a few projects now. You can use as many as you want. They switch cleaner. http://focus.ti.com/lit/ds/symlink/cd4066b.pdf 4066s are shockingly bad. At least consider something half reasomable like a DG308 or 211. Or even discrete fets. Graham The spec sheet suggests they are ok. Did you test some? |
#8
Posted to rec.audio.tech
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Where to buy HQ pot meter and source selector switch
jamesgangnc wrote: "Eeyore" wrote jamesgangnc wrote: "Edmund" wrote May be OT but I need an HQ pot meter for volume and a source selector switch for my home build pre amplifier. For the selector switch, the more selections the better! Can anyone point me in a good direction? Thanks Edmund You might take a look at chip switches. I have used them for a few projects now. You can use as many as you want. They switch cleaner. http://focus.ti.com/lit/ds/symlink/cd4066b.pdf 4066s are shockingly bad. At least consider something half reasomable like a DG308 or 211. Or even discrete fets. The spec sheet suggests they are ok. Did you test some? 4066s ? Sure. Look at the on resistance variation with applied signal level. That means DISTORTION ! They are very inferior switches for audio. The Siliconix types I mentioned are vastly better put purists use jfets. I speak as a pro-audio designer btw. Graham |
#9
Posted to rec.audio.tech
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Where to buy HQ pot meter and source selector switch
"Eeyore" wrote in message ... jamesgangnc wrote: "Eeyore" wrote jamesgangnc wrote: "Edmund" wrote May be OT but I need an HQ pot meter for volume and a source selector switch for my home build pre amplifier. For the selector switch, the more selections the better! Can anyone point me in a good direction? Thanks Edmund You might take a look at chip switches. I have used them for a few projects now. You can use as many as you want. They switch cleaner. http://focus.ti.com/lit/ds/symlink/cd4066b.pdf 4066s are shockingly bad. At least consider something half reasomable like a DG308 or 211. Or even discrete fets. The spec sheet suggests they are ok. Did you test some? 4066s ? Sure. Look at the on resistance variation with applied signal level. That means DISTORTION ! They are very inferior switches for audio. The Siliconix types I mentioned are vastly better put purists use jfets. I speak as a pro-audio designer btw. Graham Yes, I missed the variation in on-resistance with voltage. My first design job in Broadcast was to design audio routing switchers for OB vehicles. I used a Siliconix jFET as a series element, and found that I didn't even need a shunt element to provide more than acceptable isolation. However, with professional levels, I couldn't get the switch to pass or stop +22dBu and had to attenuate by 10dB going into the switch and restore by 10dB after. Nevertheless, the router that resulted was considered at the time (1973) pretty much state-of-the-art. S. -- http://audiopages.googlepages.com |
#10
Posted to rec.audio.tech
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Where to buy HQ pot meter and source selector switch
Serge Auckland wrote: "Eeyore" wrote jamesgangnc wrote: "Eeyore" wrote jamesgangnc wrote: "Edmund" wrote May be OT but I need an HQ pot meter for volume and a source selector switch for my home build pre amplifier. For the selector switch, the more selections the better! Can anyone point me in a good direction? Thanks Edmund You might take a look at chip switches. I have used them for a few projects now. You can use as many as you want. They switch cleaner. http://focus.ti.com/lit/ds/symlink/cd4066b.pdf 4066s are shockingly bad. At least consider something half reasomable like a DG308 or 211. Or even discrete fets. The spec sheet suggests they are ok. Did you test some? 4066s ? Sure. Look at the on resistance variation with applied signal level. That means DISTORTION ! They are very inferior switches for audio. The Siliconix types I mentioned are vastly better put purists use jfets. I speak as a pro-audio designer btw. Yes, I missed the variation in on-resistance with voltage. My first design job in Broadcast was to design audio routing switchers for OB vehicles. I used a Siliconix jFET as a series element, and found that I didn't even need a shunt element to provide more than acceptable isolation. However, with professional levels, I couldn't get the switch to pass or stop +22dBu Doubtless insufficient pinch-offf voltage. and had to attenuate by 10dB going into the switch and restore by 10dB after. Nevertheless, the router that resulted was considered at the time (1973) pretty much state-of-the-art. To this day I still use the J109-112 and J172-5 or whatever discrete jfet series. Graham |
#11
Posted to rec.audio.tech
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Where to buy HQ pot meter and source selector switch
"Eeyore" wrote in message ... Serge Auckland wrote: "Eeyore" wrote jamesgangnc wrote: "Eeyore" wrote jamesgangnc wrote: "Edmund" wrote May be OT but I need an HQ pot meter for volume and a source selector switch for my home build pre amplifier. For the selector switch, the more selections the better! Can anyone point me in a good direction? Thanks Edmund You might take a look at chip switches. I have used them for a few projects now. You can use as many as you want. They switch cleaner. http://focus.ti.com/lit/ds/symlink/cd4066b.pdf 4066s are shockingly bad. At least consider something half reasomable like a DG308 or 211. Or even discrete fets. The spec sheet suggests they are ok. Did you test some? 4066s ? Sure. Look at the on resistance variation with applied signal level. That means DISTORTION ! They are very inferior switches for audio. The Siliconix types I mentioned are vastly better put purists use jfets. I speak as a pro-audio designer btw. Yes, I missed the variation in on-resistance with voltage. My first design job in Broadcast was to design audio routing switchers for OB vehicles. I used a Siliconix jFET as a series element, and found that I didn't even need a shunt element to provide more than acceptable isolation. However, with professional levels, I couldn't get the switch to pass or stop +22dBu Doubtless insufficient pinch-offf voltage. That's right, but low-noise switching fets in 1973 were fairly new, and I had to find one with sufficient pinch-off, yet with the smallest variation in the on resistance with voltage. It was a trade-off, but it worked. To this day I still use the J109-112 and J172-5 or whatever discrete jfet series. Graham I'll remember those. S. -- http://audiopages.googlepages.com |
#12
Posted to rec.audio.tech
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Where to buy HQ pot meter and source selector switch
On Sat, 28 Jun 2008 11:03:47 -0400, jamesgangnc wrote:
"Edmund" wrote in message ... May be OT but I need an HQ pot meter for volume and a source selector switch for my home build pre amplifier. For the selector switch, the more selections the better! Can anyone point me in a good direction? Thanks Edmund You might take a look at chip switches. I have used them for a few projects now. You can use as many as you want. They switch cleaner. http://focus.ti.com/lit/ds/symlink/cd4066b.pdf Thanks for your suggestion but I don't want to use active switches. Edmund |
#13
Posted to rec.audio.tech
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Where to buy HQ pot meter and source selector switch
Edmund wrote:
May be OT but I need an HQ pot meter for volume and a source selector switch for my home build pre amplifier. For the selector switch, the more selections the better! That's funny. I built a pre-amp a couple years back (based on a Doug Self design), and it has exactly ONE input (CD). That's all I need it for! 8) However, I did provide the option of adding a switch and a second input in the future... And a home-theater bypass! |
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