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Remote control type music color lamp circuit (1)

2016-08-09 12:11  
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Remote control type music color lamp circuit (1)
As shown in the figure it is a simple wire type music color lamp circuit. From the speaker at both ends of the audio frequency voltage through the wire connected to the A, B end, by the potentiometer RP partial pressure applied to the audio transformer T primary, audio voltage by T followed by a boost secondary to the bidirectional thyristor control VTH electrode and the second anode. When the audio frequency voltage is high, VTH opened, festoon lamp string E light; when the music stops or is weak enough to trigger the VTH, VTH in alternating current crosses zero is turned off. Therefore, the lamp string E brightness flickers with horn playing music rhythm. Regulating potentiometer RP value can modulate circuit wire sensitivity; T canadoptsmall input transformer in transistor radio.