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Touching delay lamp switch circuit(7)

2016-08-06 01:35  
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Touching delay lamp switch circuit(7)
The circuit shown in the chart is the delay lamp which uses the principle of self-oscillation to improve trigger sensitivity. The circuit is composed of the self-excited multivibrator, touch switch, power supply circuit and thyristor switch. The circuit delay time is mainly determined by C1, R4 discharging time constant, and at the same time the R3's resistance, VT1 magnification and touching time also have an impact on the delay time.