| 摘要 |
<p>PURPOSE:To reduce an abnormal output sound at on/off of muting remarkably, by supplying a DC bias voltage to an output side of a muting circuit. CONSTITUTION:The titled amplifier circuit is formed with a DC bias circuit A grounded in terms of AC, an amplifier B biased with the bias circuit A for the operation, the muting circuit C controlling this output and an output coupling capacitor bias circuit D. A DC bias voltage is applied to an output side of the muting circuit C from a bias terminal 3 of the bias circuit A via a resistor R14. This resistor R14 is selected to have a resistance value sufficiently larger than that of a load resistor RL. Through the forming in this way, the abnormal output sound at on/off of muting is reduced remarkably.</p> |
