Sorry I missed C13 but did change the others as suggested.
Will search fo different mics. I was under impression NOISE CANCELLING meant LOUD noises were shut off.
Going to recheck my entire schematic as I allowed components from my bat project to filter into this one.
I think your opamp is too noisy to be a mic preamp and your maximum gain is way too high at 68,400 (yes, more than 68 thousand when a tone control is at max).
A sensitive mic preamp has a gain of only 200.
But how does anybody except your hearing doctor know how deaf you are? Deaf like a toad?
I have never looked at how much attenuation of sounds occur to a deaf person who can be helped with a hearing aid. 10dB? (3.16 times) 20dB? (10 times).
perhaps lower the pre amp gain by changing R5 which sets the gain on the pre amp?
I will look for a lower noise op amp in TINA as it has LOTS of examples.
Thinking just build as is and I can change the gain seeing how I am using through hole on this unit for testing purposes.
low noise etc https://www.ti.com/product/opa4134
here is the schematic we have so far. NOTE the pots are 200K as that's what I have on hand. The full circuit will use 100k and 500k as noted in the Baxandall.
I noticed the input cap WAS on the wrong side of the input bias. This TINA simulation has it on the correct side.
I changed the input signal for 2.2k internal resistance
Grounding the unused +inputs I assume is correct way to disable the unused portions of the TDA2822 and the OPA4134?
The connection wasn't there . I had to enlarge to see if there was a connection at R5 to C6
here is corrected enlarged pic.
The graph looks better?
I was under impression that R2 provided the bias but I failed to change the J1 to V+
I think the resistor that powers the mic should be supplied through an RC filter so that noise on the power supply is not fed to the input of the preamp.
I don't know where the 5V supply will come from. If it is a battery then it will bounce up and down with the signal which produces "motorboating" when amplified.
Your circuit has two circuits producing a bias voltage but only one circuit can bias both opamps.
EDIT: I forgot to say that since C6 has the huge value of 10uF then it passes frequencies down to one cycle per 6 seconds.
If it is 10nF (0.01uF) then it passes frequencies down to 16Hz.
The battery needs 100uF parallel to it.
The 2.2k resistor that powers the mic should be fed through a 1k ohm resistor from the battery then the two resistors should have a 47uf or 100uF capacitor to ground where they meet.
Hearing aid update
Have all parts purchased but before having PCboard made I want to double check my schematic https://www.electro-tech-online.com/threads/posting-a-two-page-schematic.128132/
I hate to be a bother but I plan to offer a PCboard for assistance in this endeavor. AudioGuru is on my list. Contemplating http://iteadstudio.com/ for boards. Board design is pretty much done but any suggestions are welcomed.