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From: "Spehro Pefhany"
Subject: Re: V regulator input cap size?
References: <0001HW.B9D991AD000C5917163F7590@news.covad.net> <firstname.lastname@example.org> <0001HW.B9D9CD54001A5D15163F7590@news.covad.net> <0001HW.B9DAE8B7003F6E14163F7590@news.covad.net> <3DC1A954.email@example.com> <1%hw9.136243$Q3S.firstname.lastname@example.org> <3DC1AF48.email@example.com> <firstname.lastname@example.org> <3DC1D9F4.email@example.com>
User-Agent: tin/pre-1.4-19990216 ("Styrofoam") (UNIX) (Linux/2.2.14 (i586))
Date: Fri, 01 Nov 2002 01:57:01 GMT
NNTP-Posting-Date: Thu, 31 Oct 2002 20:57:01 EST
In sci.electronics.components Fred Bloggs wrote:
> You must be thinking of ACV relays, the DC relays don't leave a lot of
> room. They have a real bad spread on pull-in voltage and it gets higher
> with temperature by quite a high percentage by the time you hit 70C. If
> you want save a current source then you could do something like this
> where the capacitor guarantees turn-on and then the DC value settles
> down to safely below over-voltage:
When you figure in the darlington drop, the two diodes in the bridge and
the small capacitor, that's effectively what my circuit does. You can
adjust the steady-state voltage boost (over the RMS input less three diode
drops plus) by changing the capacitor value. It has to be able to
withstand a lot of ripple, but typically high-voltage low capacitance
electrolytic caps don't have a problem with that.
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