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#41
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![]() "Chris Hornbeck" "Phil Allison" ** For Christ's sake Chris - do a *real test * instead of posting ASININE thought experiments with wrong outcomes. Get a length of insulated wire, connect the ends to pins 2 and 3 of an XLR, plug it into a mic pre and try the effect of having an open loop, closed loop and then twisted tightly all along its length when held close proximity to an AC power transformer. Exactly right. And if you vary the spacing between the conductors you'll discover an anomaly in your model. ** Dear Chris - you are a complete ****wit. Have a nice day. ................. Phil |
#42
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On Mon, 5 Jul 2004 16:01:24 +1000, "Phil Allison"
wrote: ** Dear Chris - you are a complete ****wit. Have a nice day. Seems like people are telling me this all the time lately. It's been real and it's been fun, but it hasn't been real fun. Good night. Chris Hornbeck |
#43
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#44
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#45
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** A voltage injected into a balanced audio line by external magnetic
fields ( like nearby high AC current cables and transformers) creates a hum signal in differential mode that the pre-amp *will* amplify - its CMRR has no effect. Hi Phil, could you explain this is more detail? I always thought that a magnetic field induced a current (or voltage) into the two wires of a mic cable (for example) in equal magnitude and angle. If I understand correctly, this isn't the case, rather, the hum induces a current/voltage in one of the wires as a postive going signal, and the other as a negative going signal. That is, they are equal and opposite in polarity. Magnetics begins to get a bit beyond me, but I understand its importance in what I deal with everyday. Thanks, Phil. Chris Deckard Saint Louis, Mo. |
#46
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Laurence Payne wrote:
On Sat, 03 Jul 2004 06:33:26 GMT, Logan Shaw wrote: So why is it you think that RF can't exist at audible frequencies? What's the definition of "RF" on your planet? :-) Here's one possible definition: http://en.wikipedia.org/wiki/Radio_frequency From the text: "The ELF, SLF, ULF, and VLF bands overlap the AF (audio frequency) spectrum, which is approximately 20–20,000 Hz". Also, there's a nice chart of how (basically) the entire spectrum is allocated at http://www.ntia.doc.gov/osmhome/allochrt.html . We used to have a poster of this on the wall at one place I worked. It's a pretty cool chart. Anyway, the chart shows allocated frequencies down to 9 kHz, just as the FCC's Table of Frequency Allocations does. You can find the latter at http://www.fcc.gov/oet/spectrum/ . Of course, even if these frequencies weren't allocated, this would not mean that the phenomenon known as "radio" can't happen at those frequencies. And you can also argue (and I'll agree) that they aren't the most useful frequencies of the spectrum. But the point is that RF can exist at audible frequencies. - Logan |
#47
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![]() "Logan Shaw" Laurence Payne wrote: So why is it you think that RF can't exist at audible frequencies? What's the definition of "RF" on your planet? :-) .. Of course, even if these frequencies weren't allocated, this would not mean that the phenomenon known as "radio" can't happen at those frequencies. And you can also argue (and I'll agree) that they aren't the most useful frequencies of the spectrum. But the point is that RF can exist at audible frequencies. ** However the term "RF" does ***not*** usually refer to such low frequencies. The term "RF interference" when used in relation to audio gear refers to audible signal breakthrough due to nearby transmitters operating on the broadcast band, short wave bands, the VHF and UHF bands and even microwave radars. Interference from signals that are already in the **audio band** is called just that - audio interference. The BIG difference is that the latter do not need to be "detected" ( ie demodulated) to become audible. .............. Phil |
#48
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![]() "Mike Rivers" Phil Allison "Monte McGuire"... Actually, it's current that gets induced by a changing magnetic field, ** Wrong - a voltage is induced. The current that flows depends on the impedances, conductor cross section etc. "Mike" ********* Horsie Maneuveres - Voltage is never induced. ** What a pig ignorant damn fool Mike Rivers is. How does a transformer produce a VOLTAGE on the secondary winding !!!!!!! Voltage is the potential difference between the two ends of a lump of impedance as a result of the current flowing through the impedances around the circuit. This is basic electricity. ** Batteries produce a *voltage*, generators produce a *voltage*, microphones produce a *voltage* etc ...... This is basic fact. ** A balanced audio line that is **NOT** twisted is just an induction loop. ********* Simplistic and incorrect conclusion - It's two induction loops. ** What a pig ignorant damn fool Mike Rivers is !!!! The loop being discussed is the ***ONE*** loop formed by the two audio lines. The one that ***IS*** normally twisted inside the cable. ................ Phil |
#49
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![]() "Mike Rivers" Phil Allison Get a length of insulated wire, connect the ends to pins 2 and 3 of an XLR, plug it into a mic pre and try the effect of having an open loop, closed loop and then twisted tightly all along its length when held close proximity to an AC power transformer. Once again, the Pretentious Pundit of Pro Audio changes the subject when he's caught in a misconception. ** More utter, pig ignorant bull**** from the Know Nothing Parrot. This is an excellent demonstration of the principle of loop area (again, I recommend Steve Lampen's book) but it doesn't tell you anything about the performance of a differential amplifier. Using twisted wire is one technique of reducing the common mode voltage applied to the inputs of a differential amplifier. ** The imbecile cannot distinguish common mode from differential mode. Connecting a loop of wire between the two terminals of a differential input and inducing current in the wire is the perfect test case, and, in fact, is a good test of the common mode rejection of the input. ** The induced *voltage* is ***differential*** - like the wanted signal. I would just ignore the snide remarks and leave his discussion except that I hate to see someone with the right information be put down with irrelevant and inaccurate responses, and more important, that the person asking a legitimate question gets misled if he got disgusted with the in-fighting and stops reading the thread. ** The only "fighting" going on originates from the poisonous keyboard of Mike Rivers. The man is nothing but a charlatan hell bent on deceiving people. .............. Phil |
#50
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![]() "mr c deckard" ** A voltage injected into a balanced audio line by external magnetic fields ( like nearby high AC current cables and transformers) creates a hum signal in differential mode that the pre-amp *will* amplify - its CMRR has no effect. Hi Phil, could you explain this is more detail? I always thought that a magnetic field induced a current (or voltage) into the two wires of a mic cable (for example) in equal magnitude and angle. If I understand correctly, this isn't the case, rather, the hum induces a current/voltage in one of the wires as a postive going signal, and the other as a negative going signal. That is, they are equal and opposite in polarity. ** Do the test I suggested with a length of insulated wire, XLR and pre-amp. Then think how a voltage is created in the coil of a dynamic, mic sent down the cable to the pre-amp and is amplified. Then realise that the connecting cable is just an extension of that same coil. Recall that a dynamic mic hums when placed near an AC power transformer ( except for those with effective, internal hum bucking coils). ............. Phil |
#51
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On Tue, 6 Jul 2004 12:44:00 +1000, "Phil Allison"
wrote: ** Do the test I suggested with a length of insulated wire, XLR and pre-amp. Then think how a voltage is created in the coil of a dynamic, mic sent down the cable to the pre-amp and is amplified. Then realise that the connecting cable is just an extension of that same coil. Recall that a dynamic mic hums when placed near an AC power transformer ( except for those with effective, internal hum bucking coils). Then recall how the hum bucking coil works. Perfect example. (Hint: it's in the same field as the innocent but offending coil). (What the heck, another hint: to be within the "same" field means to be within a small-compared-to-wavelength average distance) (OK, one more final hint: average. How to be reliably average...) Chris Hornbeck |
#52
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Chris Hornbeck wrote:
(Hint: (OK, one more final hint: He ain't gonna figure it out; at least not in public. |
#53
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#54
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#56
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#57
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![]() "Mike Rivers" wrote in message news:znr1089118480k@trad... (entire message quoted to avoid annoying Phil Allison) In article writes: ** But the ignorant prick still snips out people's names !!!!!!!!!!!!!!!!!!! "Logan Shaw" Laurence Payne wrote: So why is it you think that RF can't exist at audible frequencies? What's the definition of "RF" on your planet? :-) Of course, even if these frequencies weren't allocated, this would not mean that the phenomenon known as "radio" can't happen at those frequencies. And you can also argue (and I'll agree) that they aren't the most useful frequencies of the spectrum. But the point is that RF can exist at audible frequencies. ** However the term "RF" does ***not*** usually refer to such low frequencies. The term "RF interference" when used in relation to audio gear refers to audible signal breakthrough due to nearby transmitters operating on the broadcast band, short wave bands, the VHF and UHF bands and even microwave radars. Interference from signals that are already in the **audio band** is called just that - audio interference. The BIG difference is that the latter do not need to be "detected" ( ie demodulated) to become audible. I would say that you're describing the difference between electromagnetic interference and acoustical interference. ** Only a complete and utter ****wit would think that. The sort of ****wit who does not even know what "demodulated" means. Mike Rivers for example. Would you go away happy (going back several days) with the substitution of "electromagnetic" for "RF" in the context of my original message? ** The CMRR of a balanced input does not act to defeat "RF interference" - but it does act against EM interference which exists in the audio band. ............. Phil |
#58
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![]() "Mike Rivers" Phil Allison ********* Horsie Maneuveres - Voltage is never induced. ** What a pig ignorant damn fool Mike Rivers is. How does a transformer produce a VOLTAGE on the secondary winding !!!!!!! The same way a generator does. By a current induced by a magnetic field. ** WRONG !!!!! A varying magnetic field induces a *VOLTAGE* in a conductor !!! The rated AC voltage exists between the ends of the transformer's secondary winding even when no load is attached. ** Batteries produce a *voltage*, generators produce a *voltage*, microphones produce a *voltage* etc ...... This is basic fact. Batteries produce a voltage. This is an electrochemical process. Generators produce a *current*. ** What a complete ****wit Mike Rivers proves himself to be over and over and over ....... Generators produce an AC ***VOLTAGE*** - there is **no current** flow until some load is attached and the amount depends on the load. Microphones can go either way, depending on the type of microphone. ** All microphones produce a **VOLTAGE ** at their outputs. The output spec is given in "millivolts per Pascal". How dumb can this Mike Rivers ****** be ?????? .............. Phil |
#59
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![]() "Mike Rivers" Phil Allison: ** Do the test I suggested with a length of insulated wire, XLR and pre-amp. Then think how a voltage is created in the coil of a dynamic, mic sent down the cable to the pre-amp and is amplified. Then realise that the connecting cable is just an extension of that same coil. Recall that a dynamic mic hums when placed near an AC power transformer ( except for those with effective, internal hum bucking coils). Phil is absolutely correct. ** Snip rest of Mike River's insane crap. The guy has completely lost the plot. ............... Phil |
#60
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![]() "Mike Rivers" ** The induced *voltage* is ***differential*** - like the wanted signal. EVERY voltage is ***differntial*** - by definition, ** More of Mike Rivers insane snipping and context removal. What a **desperate fool** he make himself look with every post. He needs to learn to spell too !! .............. Phil |
#61
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Phil, you ask a question many of us have been wondering about with you.
Mike Rivers is not only real, but a very knowledgeable individual who actually takes time out of his busy schedule to HELP people whenever he can. Not just here on the newsgroup, but here locally as well as nationally, just like Scott Dorsey. If I call Mike up and need help, if he's available, he helps. He never questions my need, nor does he eat me a new asshole in charges (I'm not saying he's free). He just helps. And when it comes to his knowledge of equipment and circumstances, he's A Number One. You are consistently a pain in the butt, however, apparently that's your good side. -- Roger W. Norman SirMusic Studio "Phil Allison" wrote in message ... "Mike Rivers" Phil Allison ********* Horsie Maneuveres - Voltage is never induced. ** What a pig ignorant damn fool Mike Rivers is. How does a transformer produce a VOLTAGE on the secondary winding !!!!!!! The same way a generator does. By a current induced by a magnetic field. ** WRONG !!!!! A varying magnetic field induces a *VOLTAGE* in a conductor !!! The rated AC voltage exists between the ends of the transformer's secondary winding even when no load is attached. ** Batteries produce a *voltage*, generators produce a *voltage*, microphones produce a *voltage* etc ...... This is basic fact. Batteries produce a voltage. This is an electrochemical process. Generators produce a *current*. ** What a complete ****wit Mike Rivers proves himself to be over and over and over ....... Generators produce an AC ***VOLTAGE*** - there is **no current** flow until some load is attached and the amount depends on the load. Microphones can go either way, depending on the type of microphone. ** All microphones produce a **VOLTAGE ** at their outputs. The output spec is given in "millivolts per Pascal". How dumb can this Mike Rivers ****** be ?????? ............. Phil |
#62
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And if magnetic fields didn't induce current one couldn't walk under high
voltage lines and have a florescent light light up. That seems strange (light light), but it's true. -- Roger W. Norman SirMusic Studio "Chris Hornbeck" wrote in message news ![]() On Mon, 5 Jul 2004 15:35:20 +1000, "Phil Allison" wrote: ** For Christ's sake Chris - do a *real test * instead of posting ASININE thought experiments with wrong outcomes. Get a length of insulated wire, connect the ends to pins 2 and 3 of an XLR, plug it into a mic pre and try the effect of having an open loop, closed loop and then twisted tightly all along its length when held close proximity to an AC power transformer. Exactly right. And if you vary the spacing between the conductors you'll discover an anomaly in your model. More fundamentally, magnetic fields induce currents. To discuss the topic with ordinary mortals, you'll just have to bend your phrasing to the conventional. Or as the antique saying goes "Watch your phraseology." Chris Hornbeck |
#63
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![]() "Roger W. Norman" Mike Rivers is not only real, but a very knowledgeable individual ... ** How would YOU know ?? ............. Phil |
#64
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** But the ignorant prick still snips out people's names
!!!!!!!!!!!!!!!!!!! No, his client just quotes differently than yours does. You might want to read the Emily Postnews article in news.announce.newusers. --scott -- "C'est un Nagra. C'est suisse, et tres, tres precis." |
#65
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Oh, I forgot. You are Phil. You have spoken so whatever you say must be
true. The real question that continues to come up is "how would YOU know". You know, I have little signs up in my studio like "If you see exposed wiring don't touch it" and "Idoicy rates right up there with stupidity. If this applies to you, inform the management". Funny thing is, I was apparently thinking of you and I didn't even know it at the time.................................. Get out of my backyard dude. You have no clue and I can say that because between all of us we've solved more problems in real life situations that you have had situations by your talk. You want to talk the talk, but you simply don't walk the walk. Mike is unreproachable. Doesn't mean he's always right, but you'd never know that would you? -- Roger W. Norman SirMusic Studio "Phil Allison" wrote in message ... "Roger W. Norman" Mike Rivers is not only real, but a very knowledgeable individual ... ** How would YOU know ?? ............ Phil |
#66
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Go away, Phil. Just go the **** away.
-- Roger W. Norman SirMusic Studio "Phil Allison" wrote in message ... "Mike Rivers" Phil Allison Get a length of insulated wire, connect the ends to pins 2 and 3 of an XLR, plug it into a mic pre and try the effect of having an open loop, closed loop and then twisted tightly all along its length when held close proximity to an AC power transformer. Once again, the Pretentious Pundit of Pro Audio changes the subject when he's caught in a misconception. ** More utter, pig ignorant bull**** from the Know Nothing Parrot. This is an excellent demonstration of the principle of loop area (again, I recommend Steve Lampen's book) but it doesn't tell you anything about the performance of a differential amplifier. Using twisted wire is one technique of reducing the common mode voltage applied to the inputs of a differential amplifier. ** The imbecile cannot distinguish common mode from differential mode. Connecting a loop of wire between the two terminals of a differential input and inducing current in the wire is the perfect test case, and, in fact, is a good test of the common mode rejection of the input. ** The induced *voltage* is ***differential*** - like the wanted signal. I would just ignore the snide remarks and leave his discussion except that I hate to see someone with the right information be put down with irrelevant and inaccurate responses, and more important, that the person asking a legitimate question gets misled if he got disgusted with the in-fighting and stops reading the thread. ** The only "fighting" going on originates from the poisonous keyboard of Mike Rivers. The man is nothing but a charlatan hell bent on deceiving people. ............. Phil |
#67
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On Wed, 7 Jul 2004 11:02:51 +1000, "Phil Allison"
wrote: ** WRONG !!!!! A varying magnetic field induces a *VOLTAGE* in a conductor !!! The rated AC voltage exists between the ends of the transformer's secondary winding even when no load is attached. "A paradox, a paradox, Oh what a lovely paradox," Just the sight of a fresh post from you makes me break into song. Garth and Logan and a few others here generate some insightful questions, and there are several heavy hitters with interesting variations on answers, but nobody else brings so much .... what's the word I'm looking for? Anyway, thanks. Imagine for an instant that the textbook description were actually correct. What could you observe to be different from your model? Yours in the interest of science, Chris Hornbeck |
#68
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![]() Phil Allison wrote: How dumb can this Mike Rivers ****** be ?????? Congratulations, Phil, you have attracted the attention you seem to be craving. I wouldn't have even noticed you, but you started a new thread dissing someone who appears to know what he is talking about. A quick investigation and it appears you seem to be dissing a lot of people that seem to know what they are talking about. And your style is really quite juvenile. One would have to conclude that you, in fact, are the ******. |
#69
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"Phil Allison" wrote in message
... How dumb can this Mike Rivers ****** be ?????? Phil, what have you got against Mike Rivers? And I don't mean for that to be an opportunity for you to reply with: "because he's a dickhead", or whatever. I mean really... I've seen several threads of late wherein it seems that you just wait for Mike to post something so that you can pounce. What gives? Did he outbid you on a project? Sell you a used car that dropped the tranny two weeks later? Steal your girlfriend in seventh grade? What? -- Neil Henderson Saqqara Records http://www.saqqararecords.com |
#70
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In article ,
wrote: "Phil Allison" wrote in message ... How dumb can this Mike Rivers ****** be ?????? Phil, what have you got against Mike Rivers? And I don't mean for that to be an opportunity for you to reply with: "because he's a dickhead", or whatever. I mean really... I've seen several threads of late wherein it seems that you just wait for Mike to post something so that you can pounce. What gives? Did he outbid you on a project? Sell you a used car that dropped the tranny two weeks later? Steal your girlfriend in seventh grade? What? -- Phil is envious of Mike cause Mike can tie his own shoes George |
#71
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Sorry, forgot the traditional hint:
It's a trick question, but "nothing" is not correct. How's that for a Zen paradox, Batman? Chris Hornbeck |
#72
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Phil Allison wrote:
** More of Mike Rivers insane snipping and context removal. What a **desperate fool** he make himself look with every post. He needs to learn to spell too !! Once again, we have evidence of one of the fundamental laws of Usenet: you have incorrectly punctuated your spelling flame. (And I'm not talking about asterisks.) - Logan |
#73
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![]() "Roger W. Norman" "Phil Allison" Mike Rivers is not only real, but a very knowledgeable individual ... ** How would YOU know ?? ** I see you gave no answer to the question. ........... Phil |
#74
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![]() "Pete Dimsman" Phil Allison wrote: How dumb can this Mike Rivers ****** be ?????? Congratulations, Phil, you have attracted the attention you seem to be craving. I wouldn't have even noticed you, but you started a new thread .... ** Same old thread on my newsreader. dissing someone who appears to know what he is talking about. ** The revese is the case. A quick investigation and it appears you seem to be dissing a lot of people that seem to know what they are talking about. And your style is really quite juvenile. One would have to conclude that you, in fact, are the ******. ** Is you name really "Dim-man" ?? ............. Phil |
#75
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![]() "Phil Allison" How dumb can this Mike Rivers ****** be ?????? Phil, what have you got against Mike Rivers? ** He is a posturing fake. ............ Phil |
#76
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![]() "Logan Shaw" Phil Allison wrote: ** More of Mike Rivers insane snipping and context removal. What a **desperate fool** he make himself look with every post. He needs to learn to spell too !! Once again, we have evidence of one of the fundamental laws of Usenet: you have incorrectly punctuated your spelling flame. (And I'm not talking about asterisks.) ** How many wings have you pulled from flies today - Logan ??? Got 'em all going round in circles on your desk? ............. Phil |
#77
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![]() "Roger W. Norman" Go away, Phil. Just go the **** away. ** Poor diddums - did I upset one of Mike the Parrot's biggest fans ??? ............... Phil |
#78
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Dear
phil Ponk goes the weasel. bye bye! |
#79
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For those of you who haven't had to deal with this sort of thing before, this
post is pure Troll, so the best response is none at all. Don't even bother trying to point out how rude and stupid his posts are because that's just more ripples in the pond which is all the troll is after. This kind of troll is not pumping up his own ego by attacking a respected group member - more like throwing a rock at the center of the ant hill to see how big a swarm he can get. On Wed, 7 Jul 2004 11:02:51 +1000, "Phil Allison" wrote: "Mike Rivers" Phil Allison ********* Horsie Maneuveres - Voltage is never induced. ** What a pig ignorant damn fool Mike Rivers is. How does a transformer produce a VOLTAGE on the secondary winding !!!!!!! The same way a generator does. By a current induced by a magnetic field. ** WRONG !!!!! A varying magnetic field induces a *VOLTAGE* in a conductor !!! The rated AC voltage exists between the ends of the transformer's secondary winding even when no load is attached. ** Batteries produce a *voltage*, generators produce a *voltage*, microphones produce a *voltage* etc ...... This is basic fact. Batteries produce a voltage. This is an electrochemical process. Generators produce a *current*. ** What a complete ****wit Mike Rivers proves himself to be over and over and over ....... Generators produce an AC ***VOLTAGE*** - there is **no current** flow until some load is attached and the amount depends on the load. Microphones can go either way, depending on the type of microphone. ** All microphones produce a **VOLTAGE ** at their outputs. The output spec is given in "millivolts per Pascal". How dumb can this Mike Rivers ****** be ?????? ............. Phil |
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