Hello this is my first post so forgive me if I've posted it under the wrong category.

I'm working on a prototype that controls a 120vac receptacle with a 5vdc PIC16F690 controlling the circuit. The trouble I'm having is finding a transformer that's small, cheap (under $20), and easy to mount. The receptacle and the PIC are all in the same enclosure so using a "wallwart" isn't really feasible.

I came across this on item on ebay...
http://www.ebay.ca/itm/AC-DC-CONVER...631?pt=LH_DefaultDomain_0&hash=item3efc6b86bf
...but it seems to good to be true.

Has anyone ever used one of these before? How clean is the output signal?

 

Never used one but the manufacturer, ROHM Semiconductor is a reliable firm and I would guess it would work fine as long as the ratings are not exceeded,

Take care.
Roland

 

Note that the application example shows an additional eight components required.

 

I talked to my teach at school and he advised me to get a 120vac to 12vac transformer, then use a bridge rectifier to convert the 12vac to 12vdc, then use a 5v voltage regulator to limit the voltage to 5VDC.

I'm waiting on parts but got I got a chance to play around with the voltage regulator and it seems to be working, Thanks for the reply MrChips

 

You could gut a wall wart. The PCB in many of them are extremely small. I've done this several times:http://www.electro-tech-online.com/general-electronics-chat/93884-not-transformerless-power-supply.html#post749571 Most have a regulated output...but not all.

Ken