Electronic Circuits and Diagrams-Electronic Projects and Design
In Power Supplies

5V transformer less power supply

Description.
Here is the circuit diagram of a 5V transformer less power supply using minimum components. The working of this circuit is quite simple. Resistor R1 does the job of current limiting and bridge D1 rectifies the mains voltage. The Zener diode regulates the rectifier output to obtain a steady 5V DC and capacitor C2 acts as a filter.
Circuit diagram.

5V transformerless powersupply


Notes.

  • Assemble the circuit on a Vero board.
  • The circuit is directly connected to the mains supply, be very careful.
  • Bridge D1 can be made by using four 1N4007 diodes.
  • F1 can be a 250mA fuse.

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13 Comments

  1. sandeep

    Hi Sir ,

    I want the same circuit with 5v 100 ma

    how i will achieve this please help

  2. deepak

    Hello sir, i want to make mains operated 2 chains blinking led circuit with 25 leds in each chain and 2 chains should flashes alternately. Can you suggest me the circuit?
    plz reply!

  4. Denz

    This is very good design power supply circuit but very hazardous to put in real and delicate circuits, hence some capacitor cannot handle surge voltage from mains , additional protection should be included eg. crowbar circuit with 1 SCR and correct fuse rating.

  5. Seetharaman

    Hi Bonny you interchange both output leads just only for a single negative supply. If you want both + and – 5volts. make a 10volt supply use an op-amp to split it.

  6. bonny

    everybody knows how 2 get +5v. if possible tell about -5v from 230v 50hz supply

  7. kyriakos

    As i observe the majority of Circuits today readers
    are 220 volts doit yourselfers.
    It will be profitable in the future to design the
    gadgets in the 220-230 volts configurations.
    Thanks for all your efforts

  8. Seetharaman

    Hi friends this circuit will give hardly 5mA at 5volt. You can use for 230 volt AC 50Hz change capacitor 0.22 250 volt to 400volt. The maximum current available at 5 volt will be 10mA. warning!!! this circuit uses mains voltage extra precautions to be taken to avoid nasty electric shocks. Please inform your requirement.

  9. Pushpitha

    how can i use 230???????
    our country use 230v
    sri lanka
    PLS

  10. vimalraj

    dear Sir,
    i need 550v, 20 ma – dc led driver without using transformer are you having any idea about this circuit.