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 Sound switch circuit,using IC-1458 and SCR-C106D It will work only if the loud is overdue,for player cameras, can apply to a Burglar alarm circuit
Automatic nimh battery charger circuit that automatic cuts off. This project is good ways,Use AN4558 OP-AMP IC. Detect battery voltage when power is full.
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 car subwoofer circuit set Suitable for use with a great car audio system. Since this circuit is designed to operate with a 12 volt DC power.
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