Forum Discussion

MEXICOWANDERER's avatar
Oct 19, 2013

Discrete 120vac to 3VDC switching power supply source tips?

Ideal unit would be a circuit board with solder tab connections. 300 ma would be plenty

Hopefully not that expensive. For power pedestal power available indication. If I have to settle for 5VDC final I'll take that.

5 Replies

  • wa8yxm's avatar
    wa8yxm
    Explorer III
    For that size have you considered a Game Boy Wall Wart type? Do not think it is a switcher but at 0.3 amp who cares. It is 3 volt though. I have one I use it works perfectly with one of my Mini-Disc (Sony) recorders that also needs 3 volts and is a very very very picky eater.
  • allelectronics has all kinds of stuff
    but i'm not understanding the Idea behind this one
    since i know you have all kinds of meters and testers

    this 3v indicator for 120vac BEGS WHY ?
  • Have you given any thought to using one of the USB chargers?
    I have several that ingest 115Vac and output 5Vdc at 500ma
    I'm sure you can get one for next to nothing
    If need be add a 5vdc to 3Vdc three terminal regulator on the output
  • MEXICOWANDERER wrote:
    Ideal unit would be a circuit board with solder tab connections. 300 ma would be plenty

    Hopefully not that expensive. For power pedestal power available indication. If I have to settle for 5VDC final I'll take that.


    Do you need isolation from primary power?

    There are quite a few evaluation boards out there, plus lots of application notes if you are interested in designing your own.