555 audio broadcast remote control switch circuit

Published:2011/6/7 21:27:00 Author:TaoXi | Keyword: 555, audio, broadcast, remote control, switch | From:SeekIC

The boot delay monostable circuit is composed of the 555, R4, C3.etc, the 555 is set when it gets the power, so the 555 outputs the high electrical level, J2 closes to close the J2-1 and J2-2, the power supply is in the state of self-protection. The contact point J2-3 opens, J3 closes, J3-1 and J3-2 closes to connect the transmitter's power supply, the device is in the standby state. The monostable delay circuit is composed of the IC(555) and R4, C3, because the C3 is charged through R4, so we require it to maintain the 4 minutes no turn state before the broadcast signal coming. After the circuit outputs the 90-120V broadcast signal, the VT1 conducts, the C2 discharges, the 555's pin-2 has the low electrical level to keep the pin-3 to output the high electrical level.



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