dgardner
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- Oct 28, 2004
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A few people have asked me about front panel gain select switches for the dynalo and dynahi amplifiers. It seems desirable to have at least two gain settings, one lower and one higher.
The question is: What is the smartest way to implement the switch in the circuit?
My thinking is that if you put a 2 pole, 3 position rotary type switch into the feedback loop, one needs to be careful. Is it better to control the feedback resistor from the output to the inverting input, or the resistor from the inverting input to ground?
Also, assuming you switch in various feedback resistor values to get different gains, would you expect that the compensation capacitor would need to be unique for each gain select position?
If anyone has had success or failure along these lines, please comment.
The question is: What is the smartest way to implement the switch in the circuit?
My thinking is that if you put a 2 pole, 3 position rotary type switch into the feedback loop, one needs to be careful. Is it better to control the feedback resistor from the output to the inverting input, or the resistor from the inverting input to ground?
Also, assuming you switch in various feedback resistor values to get different gains, would you expect that the compensation capacitor would need to be unique for each gain select position?
If anyone has had success or failure along these lines, please comment.