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Automatic Broadcast Controller Circuit Composed Of 555

2015-01-27 11:03  
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Automatic Broadcast Controller Circuit Composed Of 555
The picture shows the automatic broadcast controller circuit composed of 555. This controller is made up of buck rectifier circuit, delay circuit, relay control circuit and so on. The F point in the picture is connected to the high-voltage indicator transformer's secondary stage's non-grounded port which is AC 6.3V. The signals of G point in the picture is from the self-monitoring signal transformer. This controller can control the electron tube loudspeaker. It would broadcast automatically according to the operating program which is booting (warm-up 2 to 5 minutes)→openning the high-voltage (the lower limit of broadcast time)→closing high-voltage (3 seconds)→closing low-voltage. If the loudspeaker is broken, it can shut down automatically after 10 seconds.