Schematic Power Amplifier and Layout

20 watt Audio amplifier circuit using LM1875

Power Amplifier Circuit Diagram using LM1875

LED Circuit Simple High Power LED Regulator Circuit using BD140 and BC549

Switching Power circuit diagram for tv

Mini Microphone circuit using BC109C

Circuit diagram keytop and display A keyboard “key figure” who work with electrical contact between the surface of the keyboard and the underlying circuit when pressed keytop area, used by some home computers the early 1980s, and has been widely used in consumer electronic devices.