Q1 and Q2 form a two-level audio amplifier circuit. The audio signal received by MK1 is coupled to the base of Q1 via C1. After amplification, the collector is directly fed to the base of Q2. A negative square wave is obtained at the collector of Q2. To trigger the bistable circuit. R1 and C1 limit the frequency response of the circuit to around 3kHz for a high sensitivity range. When the power is turned on, the state of the bistable circuit is that Q4 is off, Q3 is saturated, and D3 is off. When MK1 receives the control signal, it outputs a negative square wave after two stages of amplification. After the differential processing, the negative spike pulse is added to the base of Q3 through D1, which causes the circuit to quickly flip and D3 is lit. When MK1 receives the control signal again, the circuit reverses again and D3 goes out. A terminal J1 for external control equipment is reserved on the circuit board, and other equipment can be sound-controlled through the J1 connection relay. (When connecting the relay, a diode must be connected at the opposite ends of the relay coil)
Package included:
1 x Voice Sound Activated LED Switch
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