Flashing light indicates the light switch circuit

  
Figure 2 foot emitting a flashing light switch circuit indication. when s is closed, normal light E lights flashing hair light indicates power loss of power does not work shoes
Flashing light indicates the light switch circuit - schematic

. Open after s. 220V AC by lamp E and a rectifier diode VD1, R buck limit the flow of the charging capacitor c. Negative zoot Sui and capacitance C of the present circuit utilizes two-way trigger diode VDH of charge and discharge principle can constitute a relaxation oscillator, so luminous tube I, ED will flashing light at night is very eye-catching, makes it easy to find switch position. If s beat Ji, LED small light, not the light bulb filament E blown, it is a power outage. VDH may be a turning point in the voltage range of 20-40V bidirectional trigger diodes as 2CTSIA, DB3 type. I.ED most tincture high-brightness red light emitting diodes.




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