[TRLog] Need help with Keying/PTT/Paddle interface

[Don Moman]

Yes. Have built about 10 boxes for here and for other locals, my first
effort would only key on *some* of the computers, so changed to a
darlington (MPSA13 if I recall correctly). I also do not use the strobe
connection but ground the emitter. This has the side effect of keying the
radio while booting, as Tree mentioned, but it hasn't been a problem.  
This combination has worked flawlessly on a wide variety of rigs and
computers, for several years now.

73 Don VE6JY

On Mon, 25 Jan 1999, Michael Tope wrote:

> 
> Has anyone tried a darlington pair (beta multiplier)
> in place of the keying transistor? This should draw 
> very little current from the interface.
> 
> Mike, W4EF


--
FAQ on WWW:               http://www.contesting.com/trlogfaq.html
Submissions:              trlog@contesting.com
Administrative requests:  trlog-REQUEST@contesting.com
Problems:                 owner-trlog@contesting.com
Feature Wishlist:	  http://web.jzap.com/n6tr/trwish.html