From: "Frank Bemelman"
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Subject: Re: zero-power toggle circuit; was, how to master electronics
Date: Fri, 15 Nov 2002 19:46:47 +0100
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Organization: EuroNet Internet
NNTP-Posting-Date: 15 Nov 2002 18:46:56 GMT
"Winfield Hill" schreef in bericht
> "Frank wrote...
> > I saw you moved D1 ;) The overload protection is nice too.
> Yes, rotating it allows using a bracket ] for the Schottky bar. :)
> I'm not very happy with the above scheme. For one thing, combining
> short-protection with the flip-flop memory leads to awkward issues
> like we saw when charging capacitive loads, etc. Further, momentary
> current-limit conditions could reset the flop. And then there's the
> issue of the series diode, wasting power. The circuit badly needs
> further improvement, and I can picture it all in my mind.
I can picture a few things too, like arriving this circuit in my
in-box, and not making it to my out-box, hehe.
Often, it seems that the more you 'improve' it, the worse it gets. I'd go
for a simple 4013 d-flipflop, with a clear poweron-reset behaviour, and
why not, add a half-bridge to please both low-side/high-side switching
folks, or even use the second half of the 4013, a full bridge, some
jumpers, 4-state behaviour, stop-left-stop-right, making it a truly
universal pushbutton control, also adding isolation funny behaviour in
the unknown load.
The challenge lies, of course, in setting yout teeth in original design.
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