Discharge time relay circuit The timer field effect tube, and therefore have a high timing accuracy, timing and so long. When the R3-IOOOMfl, C 200VF when a delay time of 8h. P
ress the button SB, transistor VTi conduction, VT3 conduction, the relay pull KA, delay start. When the capacitor C discharges to a certain value, VT2 is turned on from off, VT3 deadline, KA released. Delay time is determined by R3, RP and C.