"Jim Yanik" wrote in message
4...
"Arfa Daily" wrote in
:



You shouldn't take things quite so literally, Phil. I was talking
about the primary side only when I said that, but yes, it pretty much
has a pair of small TO92 transistors, and a TO220 mosfet. Obviously,
it also has input filtering, a bridge, made of 4 discrete diodes, a
main filter cap, and assorted R and C to make those two little
transistors into an oscillator. About 20 components altogether. The
secondary side is exactly like any other fixed voltage typical design,
and there is, of course, a perfectly normal 6 pin opto for regulation
feedback. Better ?

Arfa



I've been wondering about how the regulating feedback loop works.
How does it modify the multivibrator's output?


--
Jim Yanik

Don't know, Jim. I don't have any schematics for it, as is ever the case,
and I have not at this point bothered to trace out the circuit in that area,
as none of the examples that were sent to me, had problems in that area.
However, I don't suppose it would be too difficult to patch the transistor
side of the opto into the CR network on one side of the multivibrator. It
would just be the equivalent of putting a pot in there. If I get time
tomorrow, I'll have a look, and see if I can figure how that bit is hooked
up. Probably no more than 10 or so components in that area.

Arfa