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DIY Sound Control Switch Electronic Components Production Kit
working principle: Q1 and Q2 are composed of secondary audio amplifier circuit£¬ audio signal received by the MK1 by C1 coupling to the Q1's base£¬ amplified by the collector directly fed to Q2's base£¬ collector in Q2 get a negative square wave£¬ used to trigger the bistable circuit. R1 C1£¬ the circuit frequency response for high sensitivity limit in the range of about 3kHz. When the power supply is switched on£¬ the bistable circuit state for Q4 cutoff£¬ Q3 saturation£¬ D3 light. When MK1 receives the control signal after two amplifier outputs a negative square wave£¬ after differential processing after a negative sharp pulse through D1 added to the Q3 base£¬ the circuit quickly reversed£¬ D3 was lit. When MK1 received a control signal circuit£¬ and flipped out D3. Note: electret mic which foot is connected with the outer casing is negative£¬ the light emitting diode and an electrolytic capacitor feet long as cathode (length is short negative) and triode installed in front of a kind of direction£¬ resistance and ceramic capacitors without polarity.