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Old 07-09-2021, 11:33 PM   #51
Badcaps Veteran
Join Date: Dec 2010
City & State: Alberta
My Country: Canada
Posts: 2,202
Default Re: Signal Tracer - Requesting input on requirements

Glad you found it, crypto guys need pure white noise for random number generation, that bad IC could be worth a fortune lol.

The 1.35k resistor is built into the IC (across pins 1-8) to set its gain at 20.
A lower impedance between pins 1-8 increases the gain. Max gain 200 is with a 10uF cap and no resistor there. Gain of about 52 (34dB) is with a 10uF and 680R for example.

You could have a high/low gain switch that just puts in the 10uF+resistor or not.
The input pot lowers gain, the amplifier should be quiet with the pot set low and no long input cables.
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