Mini Stereo Audio Amplifier using IC TEA2025

This is a very simple schematic diagram of mini stereo audio amplifier build based the main power IC of TEA2025. This IC support both single audio channel and stereo audia channel. There will be 2x2.5W for stereo channel and 5W for mono channel with bridge mode. TEA2025 is a monolithic integrated audio amplifier in a 16-pin plastic dual in line package. It is designed for portable cassette players and radios, featured with Working Voltage down to 3V, Few External components, High Channel isolation, Voltage gain up to 45dB(Adjustable with external resistor), Soft clipping and Internal Thermal protection.

Read More

100W Amplifier with Transistor 2N3055 and MJ2955

This is the circuit diagram of 100W amplifier with paired transistor 2N3055 and MJ2955. 2N3055 and MJ2955 is a silicon power transistor used mostly in amplifier and power supply circuitsbut it  is designed for general–purpose switching and amplifier applications. 2N3055 transistor is packed in a TO-3 can, the maximum power rating is 115W, voltage 60V and 15 amperes maximum with a beta gain of 20 to 70 at a collector current of 4A.

Read More

2 x 15W Stereo Audio Amplifier with TDA4935

This is the scheme diagram of 2 x 15W stereo audio amplifier using single power IC TDA4935. The amplifier is a Class B stereo and is designed with the TDA4935 from Siemens, which delivers 15 watts each channel. It can also be configured in BTL or bridge, thus delivering 30 watts in mono channel configuration.

Read More