30pcs EQKIT® Voice Sound Activated LED Switch Clapper Control DIY Kit Suite

Description Brand EQKITKit Name Clap Switch KitKit Model PSK 1Working voltage 4 5 5VPCB size 28 49mmWorking principle 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 30 x Voice Sound Activated LED Switch