This circuit is an audio amplifier with microphone for voice input it increases  weak and small signals from mobile phone and human voices.  view more

• circuits

The circuit is a very simple design consist of different components like :Transistor c1815.Resistors 1k.Battery 6-9v.Wires. Vero board(strip):Circuit description:The circuit work as a switch where by the transistor amplifys the input voltage when the voltage is been amplified the circuit bec... view more

• DIY