![]() The Q1 runs and drives currents to the coil of RY1. When the C4 charge fully to make a current flowing into pin B of Q1. While there will be current through R3 to charge C4. because the contact of relay C-NC is connected. And C3 filters to a smoothing DC voltage. Then, the current flows through D1 to the rectifier as DC voltage. There are the Zener diodes, ZD1 limited voltage to 15 volts. And the current limiting to about 41 milliamps. With these components R1, R2, C1, and C2. It is transformed to the lower voltage, 220 volts to 15 Volts. When 220-volts power inputs to the circuit. It uses contact of the relay to act switches on-off to a load. The simple delay turn on the monitor circuit I am not telling you to build this circuit. If you do not use a transformer in the power supply section. If touch this circuit get an ELECTRIC SHOCK. Because it does not use a normal transformer. Power on delay circuit without transformerĬaution! Before build this circuit below. But you should always set and be careful to check the circuit diagram before you insert the AC line onto this circuit. I know that you can build them for beginners. So you may assemble all components into a small perforated PCB.
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