I need power supply without transformer

KMoffett

Joined Dec 19, 2007
2,886
Why?

There are "transformerless" power supplies out there (Google: transfomerless Microchip), but...they are useful only at low currents...<~20mA. As the current requirements increase the electrical and physical size of the components quickly increase to a point where a transformer/rectifier/cap configuration is smaller. There are also AC-DC SMPS's that are very small and efficient, but do contain a "transformer".

Ken
 

beenthere

Joined Apr 20, 2004
15,819
We would have to insist on the use of a transformer for safety reasons. Wall transformers are quite inexpensive - why expose yourself to risk?
 

studiot

Joined Nov 9, 2007
4,998
You haven't said what voltage you are looking for, but 100mA can readily be supplied for useful periods by even quite small batteries, and of course you can use rechargeables for prolonged use.
 
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