Quote:
Originally Posted by Inna
Apologize again, but I have another question: instead of 1 Megaohm, can I use a 470 K for potentiometer P2? Due to logistical problems related to the place where I am, I can't find a higher value. Do you think it can be work better like with 1 Mohm? Is it perhaps better to also insert a fixed 100/220 ohm resistor in series with p2?
Thanks again.
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You can put 470K in series with potentiometer, that way you can adjust the gain from half to full. Or you can use a 1M trimmer and adjust it for the greatest gain without having instability. Rarely do you adjust the gain, once you find the right value, also the gain can be decreased by lowering the threshold.