Transformerless power supply Circuit
Here is a low cost and simple circuit that can be used to power up small electronics devices. The power is directly tapped from the mains via resistor R1. D1 rectifies the voltage and C1 and C2 are used to filter the output. The zener diode D2 will regulate the filtered DC and will keepthe voltage steady at 5V.
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Transformerless Power Supply Circuit Diagram with Parts List
|Zener Diode, D2||5.2V, 250mWatts`|
- This circuit can deliver only up to 2omA, there fore not suitable for serious circuits.
- You can use this power supply for small LED circuits etc .
- Remember you are playing with mains. Always be careful. The transformerless power supply can be made more safe by placing a 1Amp fuse and thus avoid damages due to short circuit. A Metal Oxide Varistor (MOV) can also be included to avoid severe voltage spikes.
Pros of Using This Circuit
- The overall weight of the circuit will be much less than that of a transformer used power supply.
- Cost can be manages as a transformer itself will cost you almost the same as the building cost of a transformerless power supply.
- Not providing options for isolation can bring a lot of safety problems.
We have more Power Supply Circuits that you may like to take a look:
1. 9 Volt Regulator 2. High and Low Voltage Cut Off Circuit 3. Mains Failure Alarm Circuit 4. Voltage Booster Circuit 5. Regulated Power Expander