This simple but powerful bass, treble, volume control is made by General Op-Amp IC LM741. The input voltage is 12V, but it will also work with 9V and 6V. This has inbuilt pre-amplifier also.
Left channel is shown. Right channel is same.
Parts List:
- IC LM741 x1 10/-
- T/C 10k,22k,100k All x1 27/-
- Triansistor BC148/548 x1 1/-
- 220uF/25V x2 6/-
- 4.7uF/25V x2 4/-
- 2.2uF/10V x1 2/-
- 10uF/25V x1 2/-
- Small resistances x12p 2/-
- Small PF x5p 2/-
TOTAL 56/-
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