5V transformer less power supply

john January 8, 2011 12 Comments

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.

Comments
  • deepak
    August 1, 2011

    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!

  • Seetharaman
    June 22, 2011

    Hi Denz F1 R1 and D2 will take care.

  • Denz
    June 21, 2011

    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.

  • Seetharaman
    May 18, 2011

    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.

  • bonny
    May 18, 2011

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

  • kyriakos
    May 7, 2011

    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

  • Seetharaman
    May 3, 2011

    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.

  • Pushpitha
    May 2, 2011

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

  • September 11, 2010

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

  • August 6, 2010

    can i use 230v?
    & how to reduce volt to 4v?

  • September 25, 2009

    can i use 230v?

  • September 21, 2009

    Have you the same schema for 220V AC?

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