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 sample pulse generator using op amp. We often use 555 timer to build a simple pulse generator. The op amp is also easy in oscillator form. More!
This is function generator using op amp. As usual the function generator will be expensive and difficult.However, this is a simple circuit with only two ICs. This circuit is suitable…
2 Surround Sound System Circuits