Re: [Amps] Relays

[Don Havlicek <n8de@thepoint.net>]

Bob,
Somewhere inside that box, I'm sure you can find 6.3v AC .... why not 
build a simple voltage doubler circuit to drive those relays?  Most 24v 
DC relays will close on 12+ volts.  It's worth a try!
Don
N8DE

Bob Maser wrote:
> This may be a little off tune for the AMPS reflector but I need 
> help(people that know me have said that for years).  I am converting an 
> old Collins 20V-3 broadcast transmitter and I need a relay to do some 
> power cutback switching.  I happen to have 2 really nice heavy duty 
> relays made by P & B but they have 24VDC coils and, since the Collins 
> rig doesn't have anything close to 24V, I would have to use a separate 
> power supply just for these relays.  But then I noticed on the P & B 
> data sheets that the coil resistance and current draw are the same for a 
> 24VDC relay coil and a 120VAC relay coil.  288 ohms/84ma and 290 
> ohms/85ma respectively.  Does this mean that I can apply 120VAC to my 
> 24VDC relay coil?  How can this be?  This violates Ohms Law.  I aint 
> about to try this until I've checked with you Elmers.
>
> Bob, W6TR
>
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