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Old 12th December 2012, 09:04 PM   #1
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Default insanely extreme high gain amplifier?

I am thinking of using 5 or 6 transistors and making an insanely high gain amplifier (not intended for audio use)
for extreme sensitivity

If it works. would it be possible to put an extremely high ohms resistor to bias it (would a million ohms or 500 thousand ohms or 50,000 ohms be enough?) to get a low but clean audio signal out of the amplifier? (only for testing purposes)
using only a low voltage power source... like 9 volts or less.
the absurdly high gain is for testing purposes with my own experiments..
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Old 12th December 2012, 09:08 PM   #2
Boscoe is offline Boscoe  United Kingdom
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Who knows how your going to bias it if we don't know your topology!
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Old 12th December 2012, 09:12 PM   #3
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Quote:
Originally Posted by realflow100 View Post
I am thinking of using 5 or 6 transistors and making an insanely high gain amplifier (not intended for audio use)
for extreme sensitivity

If it works. would it be possible to put an extremely high ohms resistor to bias it (would a million ohms or 500 thousand ohms or 50,000 ohms be enough?) to get a low but clean audio signal out of the amplifier? (only for testing purposes)
using only a low voltage power source... like 9 volts or less.
the absurdly high gain is for testing purposes with my own experiments..
More parameters are needed, AC coupled, bandwidth? The noise of 1 Meg Ohm "extremely" amplified could be > 9V.
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Old 12th December 2012, 09:12 PM   #4
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just a simple bias
Runs off of DC battery.. ac-coupled or not i'll try both
doesn't matter what frequency... if it will work from 1hz to 10,000hz that's okay to me.

Last edited by realflow100; 12th December 2012 at 09:14 PM.
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Old 12th December 2012, 09:17 PM   #5
DF96 is online now DF96  England
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It will oscillate.
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Old 12th December 2012, 09:19 PM   #6
Boscoe is offline Boscoe  United Kingdom
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Not if he doesn't use feedback.

OP are you bothered about distortion? Current drive? How much gain do you want?
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Old 12th December 2012, 09:22 PM   #7
DF96 is online now DF96  England
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A very high gain amplifier is quite capable of finding its own feedback mechanisms: grounds, supply rails, circuit loops, stray capacitance.
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Old 12th December 2012, 09:34 PM   #8
dmills is offline dmills  United Kingdom
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Yea, but I get the feeling the OP does not really understand what high gain means, or what the implications of various bias schemes are.

In some ways low noise amps at high gain are easier than the same thing at low gain, making say 50dB gain with Ein of say 3nV/root hz is while not exactly easy not massively hard, doing the same thing with only 10dB of gain is a complete pig.

And, yes, there is pretty much always feedback, so you may as well make sure there is lots of it and that it is negative....

Regards, Dan.
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Old 12th December 2012, 09:40 PM   #9
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How much gain did you have in mind?
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Old 15th December 2012, 06:37 PM   #10
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it doesnt matter how bad it distorts if it puts out a decent voltage to make a speaker cone move i'll be happy
and if it will turn on at 0.001 of a volt or less I'll be happy
its not an audio amplifier for any clean signals at all.. just extremely high gain.. really really high gain. like higher gain than a 40,000 watt car amplifier in bridged mode but far less output power overall maybe less than a tenth of an amp or so
running off of just a 3 volt or 5 volt power supply... nothing powerful..
it doesnt matter how bad or what the waveshape of the output is... if the output is consistent at least it'll be perfect.
i've actually one time got a amplifier that ran off of 2 triple A batteries it sounded prefectly clear with my computers headphone output hooked to it. not too loud but perfectly listen-to-able a few feet away
and biased weakly (just trying different resistors until it sounded clear and best volume)

Last edited by realflow100; 15th December 2012 at 06:41 PM.
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