Cheap power supply prototype

(transform less power supply -3 )
This power supply circuit is very stable and suitable for MCU and sensor I made this design after troubleshooting several relay modules, sensor, l
Then modified it but itโ€™s still under development.
bridge :slight_smile:
dc capacitor :
relay :slight_smile:

The circuit:

we made capacitive power supply before 1uf will give you a high current suitable for sensor and relay after rectifier AC to DC 20 K ohm should be 5w to afford the current when the transistor is open circuit and led make it too after the sensor will send the signal to the transistor , it will trigger the relay too can be from 5v to 24 v but if you increase relay voltage, you should decrease R3 resistor and the odds

the link of the circuit :

feel free to ask me any question:


Facebook: Eng. Darwish Ali

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