This is low noise tone control circuit using 4558 or NE55532, easy make with one PCB layout board, can adjust bass treble mid volume,also use to microphone.
A stereo pre amplifiers with active tone control circuit that has been popular for more than 40 years is this circuit which use the RC4739 as main components.
The Mini stereo tone control circuit with IC, circuit diagram use just IC-TDA1524 and a few parts, It adjust Volume, Balance, Bass, Treble in small circuit
This is a general-purpose bass booster circuit. Why should you use this? You are listening to your favorite song. But it lacks many flavors. Friends said No Bass! Buy a new one amplifier right now. Stop... It is true. Your amplifier may less bass. But before buying a new amplifier. Try this, it probably better.
This Guitar preamp circuit for over drive before to the power amplifier or headphones. It is a very clear sound no noise. Because use 12AU7 vacuum tubes [...]
It is Very simple amplifier circuit using transistor 2N3904 only, low noise than normal IC circuits, low distortion,frequency response: 20 Hz to 20 kHz.
This is Super stereo pre tone control project using LF353 low noise op-amp, easy to builds with PCB can adjust bass treble and volume on one PCB board.