This is First stereo tone control board for a electronic students, so small,easy to build all in one PCB ,cheap. use transistors, few parts so low noise
The Hi Fi preamplifier circuit project to tune smooth bass-treble, with a very low distortion. Use low noise transistors Frequency response range 20Hz-20KHz
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. Due to its features that the bass heavy, and treble sound is crystal clear. Due to its features that the bass heavy, …
The simple low voltage preamplifier circuit for headphone with tone control that use 1.5V X 2.The transistors as main. For MP3 player or other small source.
This is Active bass boost circuit with PCB layout using IC-741 or LF351 op-amp as low frequency filter circuit diagram ,Select frequency by change RC only.
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.
This is a bass booster circuit that use transistors as base. It is designed to increase a low frequency of audio on cheaper than ICs or normally circuit.