21W Class AB Audio Amplifier

21W Class AB Audio Amplifier
This is the circuit design of 21W class AB audio amplifier uses power transistors as the main part. It is a simple design, and simple to set up. Set the 10k trimmer to about half way and the 470 ohm trimmer to 0 resistance. Power up and set the quiescent current to 30mA by trimming the 470 ohm trimmer. Once done, measure the offset voltage. Trim the 10k so that between -30 and 30mV is measured. The amplifier should

TDA2050 Amplifier with Current Environmental Protection

TDA2050 Amplifier with Current Environmental Protection
Here the TDA2050 amplifier with current environmental protection. In this scheme, there is a current environmental protection: the signal from the output passes through the connecting cables and chains of the column (in this case takes into account the reactance of the circuit section of the 4th pin of the chip to R3), then the signal is removed from the NFB by R2 R3 and fed to the inverted input circuits . (more…)