Amplifiers on 4 transistors with floating food. Scheme, description

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Amplifiers with 4 transistors with floating power supply. Encyclopedia of radio electronics and electrical engineering

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Encyclopedia of radio electronics and electrical engineering / Transistor power amplifiers

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The next two schemes have an interesting feature. The AC output stage transistors are connected in a common-emitter circuit, so they require a small excitation voltage. No traditional voltage boost is required. However, for direct current, they are connected in a common collector circuit, so a floating power supply that is not connected to ground is used to power the output stage. Therefore, a separate power supply must be used for the output stage of each channel. In the case of using pulse voltage converters, this is not a problem. The power supply of the prestages can be shared.

Amplifiers on 4 transistors with floating supply. circuit diagram

The AC and DC FOS circuits are separated, which, in combination with the quiescent current stabilization circuit, guarantees high thermal stability at a shallow AC FOS depth. For MF / HF channels - an excellent scheme

Author: A. Shikhatov; Publication: bluesmobile.com/shikhman

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