On Mon, 28 Jan 2002 16:46:29 -0800 rich <2@mail.vcnet.com> writes:
<snip>
> >>- 1N5357 5W, 20V, DO-5 case zeners currently cost 80-cents US each
at
> >>Digi-Key. 20 would be needed for a 4cx250R supply - 18 for a
4cx250B
> >>supply. The safe current carrying ability is c. 85mA - which enough
for
> >>8, 4cx250s in linear service.
> - R. L. Measures, a.k.a. Rich..., 805.386.3734,AG6K,
Hi Rich,
Well, it may be cute to tile a vectorboard with those but, it isn't
economic at $16.
A suitable power FET costs a $1 these days. Add another $1 for a
voltage regulator IC and a few small R's & C's. Get fancy, add a trimpot
for voltage adjust so you have "something to turn" and you have a $3
regulator.
73,
Marv WC6W
*
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