Roff
Well-Known Member
That's pathetic. I wonder what grade the guy got?audioguru said:The analog part of the circuit uses slow LM324 opamps that work poorly at ultrasonic frequencies, and their input polarities are backwards.
The input capacitor's value is so tiny that it passes frequencies only above about 1MHz and the feedback capacitor's value is so big that it cuts frequencies above about 7kHz.