555 20-channel responder circuit

Published:2011/5/30 19:09:00 Author:TaoXi | Keyword: 20-channel, 555, responder | From:SeekIC

The astable multivibrator is composed of the 555 and R2，C3. When you open the valve switch, this circuit will automatically close the linkage switch K, at this time the photoresistor RG has high resistance, pin-4 has the high electrical level, so if the power supply is connected, the circuit will start working Immediately to trigger and conduct the SCR, so C4 is continuously charged through R1 and R2, then is continuously discharged through SCR and L1, the secondary stage of the transformer T1 will produce the 10kV HVAC, this HVAC is discharged through the electrodes to automaticly light the gas furnace. Then because of the firelight illuminates RG, RG has the low resistance, so pin-4 has the low electrical level (lower than 0.6V), the SCR cuts off.



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