| 摘要 |
PURPOSE:To prevent occurrence of the click noise at the switching time of the output signals, by applying the base control signal of the other transistor before the potential of the control signal applied to one transistor base is extinguished. CONSTITUTION:The signals applied to input terminals 9 and 10 are led to the collectors of transistor (TR)12 and 18 via capacitors 11 and 17 each. And the control signals are supplied selectively to base terminals 14 and 20 of TR12, 18, and the outputs from TR12, 18 are extracted to output terminal 16 via capacitor 15. Here resistance 21 is inserted between the common-connected emitter and the earth of TR12, 18. Thus the base control signal of the other TR is applied before the potential of the control signal applied to the base of one TR is extinguished in case the output signal is switched to terminal 16. As a result, the click noise occurring at the switching time of the output signals can be prevented. |
