[Elecraft] 24 VDC Relay Drive with K2

Mon Nov 3 21:25:59 2003

Got to K6XX's web site, and look for his relay speedup hack,
http://www.k6xx.com/radio/fastrely.pdf.

It works by applying twice the voltage to the coil to make the relay
swicth faster.  It turns out, this technique will also work to drive
most 24V relays with 12V, since they'll hold with 12V, but won't
switch.  This provides provides the 24V pulse to switch the relay, but
12V will hold it.  DEM has a small kit that does the same thing, but
with a relay instead of a transistor, so people can use surplus 26VDC
coax relays.

73, doug

   From: "Dwight N4GSD" <[email protected]>
   Date: Mon, 3 Nov 2003 20:57:02 -0500

   Group,

   Bought the amplifier keying kit, I need to drive a 24 VDC relay. Any
   thoughts on a simple keying circuit to add on to it?

   Pictures of the amp I bought at:

   http://agnew.us/dwight/amp/

   Thanks for any idea's of circuits that might help.

   >>>> Dwight N4GSD  <<<<

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