Abstract
This article main introduction practical low frequency power amplifier.This article first to has carried on the introduction with the power amplifier related some knowledge.Afterwards can the corresponding introduction power amplifier unit electric circuit - pre-amplification, the tonality control circuit, the volume control circuit and the power enlargement part.Through the analysis low frequency power enlargement electric circuit, has carried on the profound understanding to the power amplifier. The merit puts the electric circuit for the this aircraft main amplifier, but the negative feedback in the conductive coupling enlargement electric circuit can the effective stable operating point, therefore this article will make the detailed analysis and the estimate to them. In addition, this article will also carry on the careful analysis to the entire electric circuit principle of work.
Finally, this article can in detail narrate the practical low frequency power amplifier installment and the debugging, and to debugs the question which in the process appears to give the briefing.
Key word Low frequency power amplifier;Pre-amplification;Tonality control circuit;Volume control circuit