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Current limiting audio amplifier circuit

2015-01-04 00:01  
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Current limiting audio amplifier circuit
The circuit shown in Figure 18.44 uses NE541 high voltage power amplifier, and its current gain is 90dB at the frequency range of 20Hz ~ 20kHz; when it has 300mV rms input, output high voltage level RMS is 20V. The internal IC is equipped with short-circuit protection. The external current limiting network provides the additional protection. The two output transistors can increase the output power to 75W to drive the speaker.