"Arfa Daily"
"Phil Allison"
"Arfa Daily"

I've been given a number of switchers to look at, by a company that I do
other work for. The one that concerns me here, is an open frame type,
single 12 volt output at, I would guess, 3 - 4 amps. It appears to be a
very simple design, in that the chopper drive circuit is discrete,
employing two bipolar transistors as an astable. The output of this is
fed pretty much directly to the gate of a single FET. In the drain of
the FET, is a single primary winding up to the raw rail from the input
bridge.


** What sort of SMPS is this ??

One that puts out regulated DC ???

Or is it for driving 12V halogen lights with raw high frequency energy.



No, it's regulated DC.


** With just two transistors and one mosfet ?

That is what you have told us.

And SFA else.


.... Phil