Multi Volt Transformerless Power Supply - Simple Electronic Project





Diagram of AC 240V to DC 12V Converter


Components Needed for this Project:

You can get the components from any of the sites below:

  1. 105j (400v) Capacitor [See Buy Click Amazon]
  2. 4.7uF (50v) Capacitor [See Buy Click Amazon]
  3. 560K Ohm Resistor [See Buy Click Amazon]
  4. 2.9 Ohm 2 watt Resistor [See Buy Click Amazon]
  5. 22 Ohm 2 watt Resistor [See Buy Click Amazon]
  6. 1N4007 Doide [See Buy Click Amazon]
  7. 12V Zener Diode [See Buy Click Amazon]
  8. 9V Zener Diode [See Buy Click Amazon]
  9. 6V Zener Diode [See Buy Click Amazon]
  10. 3V Zener Diode [See Buy Click Amazon]

*Please note: These are affiliate links. I may make a commission if you buy the components through these links. I would appreciate your support in this way!

Related Basic Electronic Mini Project Circuit Diagram:


Working Principle




Frequently asked questions

What is a transformerless power supply?

Definition: A transformerless power supply converts a high AC input voltage single-phase line (120V or 230V) to the desired output DC low voltage (3V, 5V, or 12V) with a low current output in milliamps. It is used in low-power electronic applications like LED light bulbs, toys, and household appliances.

How do I reduce 220V to 12V without a transformer?

The bridge rectifier rectifies this 220V C to a higher 310V DC due to the RMS peak conversion of the AC waveform. This 310V DC is instantly reduced to a low-level DC by the next zener diode stage, which shunts it to the zener value. If a 12V zener is used, this will become 12V, and so on to output line.

How can I reduce the AC voltage without a transformer?

You can step voltage down with a series capacitor or with a switchmode circuit and inductor, but it's usually important for a low-voltage circuit to be isolated from the AC line 220V.

How do I reduce 24V AC to 12V AC?

The transformer will step down the voltage from 24V to 12V, and the rectifier will convert the AC to DC line. You can also use a voltage regulator to ensure a stable 12V output. Make sure to follow safety guidelines and consult with a professional if you're not familiar with electrical work for a single phase.

Which device converts AC to DC?

A rectifier is an electrical device that converts an alternating current (AC) line, which periodically reverses direction, to a direct current (DC) line. which flows in only one direction in an electrical line with a single phase.

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