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TL071 Audio Amplifier with 6 channel mixer.
Old 23rd January 2019
  #1
Here for the gear
 
TL071 Audio Amplifier with 6 channel mixer.

I used online filter calculator to find the value of each Hz filter for 6 channel mixer to match my hearing test to build a hearing aid. Each filter needs a volume continue but I have no clue where 6 volume controls should be without screwing up each filter?
Old 23rd January 2019
  #2
Lives for gear
 
Richard Crowley's Avatar
 
🎧 10 years
It sounds like you are describing a "parametric equalizer".

A parametric EQ allows you to adjust the center frequency, the "Q" (width), and amount of cut/boost of each filter.
Here are a couple of examples of parametric EQ circuits.
There are hundreds of examples on Google image search for: parametric equalizer circuit



Old 23rd January 2019
  #3
The 071 is a poor choice for a hearing aid. 22 nv/hz noise is too much. Try the OPA1641 at 5 nv noise and even less power consumption.
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