[Elecraft] 24 VDC Relay Drive with K2

[Tom Hammond]

The only thing I'd be the least bit concerned about might be the CURRENT 
required to key the amp relay, and possibly the addition (if not already 
there) of a swamping diode across the relay coil, to help protect against 
back EMF when the coil field collapses.

73,

Tom  N0SS

At 09:45 PM 11/3/03, Vic Rosenthal wrote:
>Dwight N4GSD wrote:
>>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?
>
>I built something very similar a number of years ago!  Anyway, the amp key 
>kit will probably handle the 24v relay circuit, assuming that the 24v 
>supply is built into the amp.  If it is wired so that you need to ground 
>the relay coil to operate, and +24 appears on the control line, then it 
>can be keyed directly by the transistor directly.  Otherwise you may need 
>the relay in the amp key kit.  Be sure to set 8r hold and t/r delay in the 
>K2 so that the relay stays closed while you are sending CW, since the 24v 
>relay is quite slow.