555 distance remote control amplifier switch circuit

Published:2011/6/7 19:27:00 Author:TaoXi | Keyword: 555, distance, remote control, amplifier, switch | From:SeekIC

When the rebroadcasting station's distribution transformer T1 outputs the 1kHz audio signal, the subprime stage L2's sensing signal is rectified by the circuit to make J1 to close, the contact points J1-1 and J1-2 which are connected with the city electricity turn on, the transformer T2's subprime stage is rectified and filtered by the circuit to supply power to the power self-locking delay circuit which is composed of the IC(555).etc. In the power self-locking delay circuit, the charging time of the IC(555) monostable circuit is td=1.1R3C3, it is about 2 minutes, this means in the intermittent time (less than 2 minutes), the 555 will not stop because of the monostable delay effect. After the announcing, T1 has no input signal, J releases, and after 2 minutes the J2 releases too, the power self-locking circuit cuts off.



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