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From: "Spehro Pefhany"
Subject: Re: V regulator input cap size?
Newsgroups: sci.electronics.components,sci.electronics.design,alt.engineering.electrical
References: <0001HW.B9D991AD000C5917163F7590@news.covad.net> <3db451b5.4005327@news.texas.net> <0001HW.B9D9CD54001A5D15163F7590@news.covad.net> <0001HW.B9DAE8B7003F6E14163F7590@news.covad.net> <3DC1A954.6080404@nospam.com>
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Message-ID: <1%hw9.136243$Q3S.53471@news01.bloor.is.net.cable.rogers.com>
Date: Thu, 31 Oct 2002 22:18:37 GMT
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NNTP-Posting-Date: Thu, 31 Oct 2002 17:18:37 EST
In sci.electronics.design Fred Bloggs wrote:
>
>
> Spehro Pefhany wrote:
>> If the supply voltage is 24VAC you can use a 24VDC
>> coil by isolating the filter capacitor from the relay coil with an
>> additional 1N400x diode.
>
> What exactly do you mean by isolating the capacitor with a diode?
Quick and dirty ascii art:
LED(s)
x--[Rs]-->
|
x-------------------------------------x------x-----x
x---------x | 1N400x logic supply | diode
------|~ + |---x----|>|---x----[R1]---x---------x-> [K1] |
| | |+ |+ | | x-----x
24 | W04M | [C1] [C2] /-- / [C3] |/ Darl.
VAC | | | | /\ ZD1 | |\ E
------|~ - |---x----------x-----------x---------x-----------x
x---------x |
0V
C1 << C2, so C2 does not have to supply relay (or LED) current, just
the logic and zener bias current.
Best regards,
Spehro Pefhany
--
"it's the network..." "The Journey is the reward"
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