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.
These are Tone control circuit using op amp - NE5532 or 4558 IC as low noise, with PCB layout, can adjust sound frequency and tone bass, treble, mid and..
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 [...]
These are many pre tone control circuit, use transistors as main. so low noise,good sound, cheap and easy to buy parts, you can builds with PCB layouts
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.
t is Treble Booster circuit help give the sound of music that you listens to bright go up. it is cheap, easy to build because a few pats with IC-741.
The Passive tone control circuit, to adjust bass-treble with no the expansion, use equipment R and C only, to filter frequency,easy without power supply! [...]