The OTL power amplifier is a push-pull amplifier with no output transformer. The output terminal and the speaker have only one DC blocking capacitor, which makes the power amplifier smaller in size and easy to cooperate with the integrated circuit. The frequency response is small, the distortion is small, and it is not easy to self-excited. The basic part is a complementary symmetrical circuit, which can realize the alternate operation of two push-pull tubes, and the output waveform is synthesized on the load, and the circuit efficiency is close to ideal. A single power supply is required in the utility circuit. It is necessary to adjust the output stage of the composite pipe and its working point, and cooperate with the current limiting and the connection with the preamplifier stage to ensure high fidelity and proper power output. However, due to the influence of the output capacitor, the low frequency lower limit frequency is limited.
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