Different ascension or the high and low attenuation
Five times magnification ≧, input impedance ≧ 200 k
Frequency range of 400-4 KHZ
Audio control range to 400 hz + 2 ∽ 4 KHZ plus or minus 2 times
(ascension or attenuation is less than 2 times, can be greater than 2 times)

CodePudding user response:

Only do the LM386 audio amplifier circuit gadgets, don't know can meet your requirement

CodePudding user response:

reference 1st floor qq_42580947 response:

only done LM386 audio amplifier circuit gadgets, don't know can meet your requirements

Is to use LM324, LM386 is power amplifier, also can be used together

CodePudding user response:

Try different active filter topology design, order basically can achieve more

CodePudding user response:

Active filter topology design?