How To Make a Transformerless 12V Power Supply | 12 volt DC power supply without transformer

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

While transformers are the most common method for increasing AC voltage, another option is to use a voltage multiplier circuit diagram. A voltage multiplier is an electronic circuit that uses a combination of capacitors and diodes to increase the voltage of an AC input.

You can step the 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.

Here's the punchline: transformerless power supplies DC lines are safely useable only in situations where the entire device can be enclosed and nobody can accidentally come in contact with any part of its electronic project.

Touching a 12-volt supply will give a relatively low amperage (in the 'safe' range). Touching a 230-volt supply will give a relatively high amperage (in the dangerous range).