LM1875 is a 5-pin single-row V-type in-line plastic IC produced by National Semiconductor Corporation. It is a high-fidelity audio power amplifier integrated circuit. The main technical indicators are:
Frequency response range: 20Hz-20kHz
Load impedance: 8/4 ohms
Distortion rate: 0.05% at 40W output
Voltage range: 20-60V
The NE5534 is an operational amplifier designed for audio amplification for audio preamplifier circuits. Its pin functions are as follows:
20W high fidelity power amplifier circuit composed of NE5534+LM1875
Note that the filter capacitor of the LM 1875 power supply terminal (5-pin) cannot be omitted during production, and the closer to the pin of the LM 1875, the better. Its role is to prevent the LM1875 from generating self-excitation. The LM 1875 also requires a heat sink.
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