| 摘要 |
PURPOSE:To prevent crossover distortion while keeping a small current at non-signal, a small feedback amount without any externally mounted capacitor by flowing a current in following to one operating current of a couple of transistors (TR) poled the same of single ended push-pull connection. CONSTITUTION:A current flowing to a power TR16 is detected by a TR18 and a current flowing to a base of the other power TR17 is controlled by a TR19 based on the detected current. When the power TR16 is turned on sufficiently, a collector-emitter voltage of the TRs 18, 19 is lost and the detected current goes to zero, then the detected current becomes a second harmonic and since the current flows at periods between positive and negative half cycles and the TR17 is driven, the crossover distortion is prevented surely.
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