Phase inverter for bridge amplifier. Encyclopedia of radio electronics and electrical engineering
Encyclopedia of radio electronics and electrical engineering / Transistor power amplifiers
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To obtain more power in the UMZCH, a bridge mode is often used. If you have a stereo amplifier, you can almost double its output power using the circuit shown in Fig. 1.
It is a cascade with a divided load. At the VT1 collector, the signal is inverted, but not at the emitter. By connecting the inputs of both channels of the stereo amplifier (Fig. 2) to the proposed circuit, we will obtain antiphase signals at their outputs.
This allows you to connect a BA1 loudspeaker to the channel outputs. By installing a low-pass filter (LPF) in front of the phase inverter, we get a subwoofer that can be used in conjunction with low-power stereo systems that poorly reproduce low frequencies.
Author: I.Sagidov, Shchara village, Dagestan
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