Keyer dimmer table lamp circuit

Published:2011/10/26 20:58:00 Author:May | Keyword: Keyer, dimmer table lamp | From:SeekIC

Keyer dimmer table lamp adopts two touch buttons to adjust the light. The light changes weaken from strong when peopletouch one of the buttons, and it changes strong from weaken when peopletouch the other button. Working principle The principle of this circuit is shown in diagram 1. Capacitance buckDC power supply is composed of VD1, VD2, C2 and C3. Triac VS's trigger circuit is composed of MOSFET, C1 and so on. DW is protecting diode. It can prevent the grid breakdownfrom FET. When people press down S1, R1 charges to the C1 to increase the grid bias, then the silicon-controlled rectifier's trigger current rises, the breakover angle increases, the optical fiber increases; when people press down S2, C1 discharges along the R2, the grid bias drops, silicon-controlled rectifier's breakover angle lessens, the optical fiber changes darker.



Reprinted Url Of This Article:
http://www.seekic.com/circuit_diagram/Electrical_Equipment_Circuit/Keyer_dimmer_table_lamp_circuit.html

Print this Page | Comments | Reading(3)