A simplified version of the class B power amplifier. Encyclopedia of radio electronics and electrical engineering
Encyclopedia of radio electronics and electrical engineering / Transistor power amplifiers
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The amplifier has the following main technical characteristics:
Rated output power . . . . . . . 15 W
Harmonic distortion .......... 0,03%
Operating frequency band .......... 20 ... 80 Hz
Signal-to-noise ratio. . . . . . . . . . 90 dB
Supply voltage ........... ±17 V
Quiescent current .............. 0 mA
Schematic diagram of the amplifier is shown in Fig.1. It consists of a pre-amplifier (DA1, VT1-VT4) operating in mode A, and an output stage (VT5, VT6) operating in mode B. The bridge is formed by parts R10, R11, R12, C11. L1. The device works similarly to the previous one.
Ris.1
Transistors VT3 - VT6 are installed on a common heat sink through mica gaskets.
Coil L1 is wound with wire PEV-2 1,0 on a frame with a diameter of 7 mm turn to turn in two layers and contains 40 turns.
Establishing an amplifier, correctly mounted from serviceable elements, consists in adjusting the bridge by selecting capacitor C11 to minimize non-linear distortion. To power the amplifier, you can use a bipolar source that provides at a voltage of ±17 V a current of at least 1 A. The amplitude-frequency and phase-frequency characteristics of the adjusted amplifier are shown in Fig. 2.
Ris.2
Literature
- D.I. Ataev, V.A. Bolotnikov. Practical schemes for high-quality sound reproduction. M. Radio and communication. 1986
Publication: N. Bolshakov, rf.atnn.ru
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