LM1875 20 Watt Audio Power Amplifier
With LM1875, we can build a low cost but high performance audio power amplifier. With 50V power supply, it can produce 20W output power for 4 or 8 ohm speaker. We can even get 30W output if we use 60V and 8 ohm speaker. Here is the schematic diagram of the circuit:
This integrated circuit audio power amplifier has very low distortion level, it gives only 0.015% distortion at 20W (1KHz testing signal) according to its datasheet. This integrated circuit (IC) is also featured with thermal protection and short circuit protection (DC and AC short). Its wide range operating voltage make it possible to accept input voltage between 16 to 60 volts.