A touch-AC electronic switching circuit

  
Diagram 2 shake tube n. Capacitance C. Trigger voltage rectifier filter element. H is a trigger voltage transistor amplifier circuit, three pull tube n, U, v. Composition trigg

er thyristor as BCR diac. LED switching status display, c6. G. day. DW, dish for the power circuit section. When touched with a finger briefly under speculation inch touch sheet, the bodys AC induction voltage through the diode rectifier, capacitor c, filter plus obtain a pulsating DC voltage, input A transistor base so conduction, H set an electrode current two routes, all the way to the flow of R.V2 base because it is a short touch, so collector current is short, the current does not cause C, the voltage changed greatly .K not turned on, and the other JL! stream troops, R, U G pole, so n will have collector current flowing through the n base, so n.V4 from off state into saturated conduction state exhausted, the n-nest high electrode electrically him (nearly 6V supply voltage). the a current through the SCR system very romantic person, SCR BCR conducting open shoulder .DZ light bulb. and when the high potential electrode V-ju, will maintain the current through the island, K3 inflows U base, maintain U. the V4 saturated conduction state. to turn off power to the switch, just simply touching a finger again to bring films, Rang contact time is more than 3 seconds, so collector electrode has a longer duration of current flows through Rz charge to C3, when the white charging to 0.7V, n is turned off and the n low potential, V4 also turned off thyristor gate current losing BCR cut LL.DZ lamp goes out. after touch-up, U, V held in the off state.




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