[Elecraft] I Went and Did it Now?

[W2AGN]

On Thursday 13 June 2002 16:21, Ron D'Eau Claire wrote:

>
> My guess is that you "fried" the MCU with the voltage. Your interface
> probably pumped significantly more voltage into the key lines than the
> normal bias provided by 5A. Normally, I'd use a simple transistor switch to
> ground to key the rig electronically, with the collectors only receiving
> what voltage is provided by 5A through those 82 k ohm resistors.
>
> Ron AC7AC
> K2 # 1289


Ron,

Looks like you hit it. I tried substituting an old V1.06 MCU, and sure 
enough, it worked. 

The MCU I blew was V2.01B. I'll go see about ordering a new one.

-- 
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