legg wrote:

On Sat, 29 Sep 2012 16:01:51 -0700, Jim Thompson
wrote:


On Sat, 29 Sep 2012 18:54:28 -0500, legg wrote:


On Sat, 29 Sep 2012 08:44:22 -0700, Jim Thompson
wrote:


On Sat, 29 Sep 2012 07:18:57 -0500, "Rick"
wrote:


"Jim Thompson" wrote in
message ...

On Fri, 28 Sep 2012 21:57:20 -0500, legg wrote:


On Thu, 27 Sep 2012 12:44:00 -0700, Jim Thompson
wrote:


AC Cap Dropper DC Power Supply

Anyone know of a clever way to regulate other than the typical
brute-force zener clamp?

...Jim Thompson

Power level? Input range?

RL

0.8W, Input is 220VAC/50Hz full-wave-rectified.

...Jim Thompson

[snip]

The capacitor must go between the AC line and input to the bridge. It uses
the reactance of the capacitor as a dropping resistor.


Nonsense, all it requires is a _changing_ input.

...Jim Thompson

With appropriate discharge paths. If the cap is before the rectifier,
the source can do this, otherwise........

RL

Or a PFC path... that's all I can say right now ;-)

...Jim Thompson


Who's on first.

RL
You know, Jim really shocks me, he designs IC's and yet, he has this dilemma

Getting information from him is like pulling teeth.. It would be nice
to know the output voltage requirement. We already know the watts (0.8),
but at what voltage on the output?

I offered up a bad idea of a design, just like him asking for
something that should be trivial on his part.

WHen he said a "Cap dropper" I miss read and gave him a "Crap dropper"
or did I?

The circuit I offered up however, works great as a line noise detector.

Jamie