[CQ-Contest] Stackmatch with push buttons

[Peter]

Peter schreef:
> Hi
>
> I'am looking for idees to switch a stackmatch with push buttons
> Just that simple A or A+B or B with 1 push on the one of the 3 buttons
>
> Peter
> PC2A
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>   
Hi

I only got buy this and that. But he this is a hobby.

I searched the net and found : 
http://www.n2nl.net/gallery/album25/bevbox?full=1
I used this switch as start point

So I to add hot switch protection.
I found the solution at page 6 http://www.pvrc.org/Newsletters/jun04.pdf

I have added an AND port between pin 13 (CD4072) an pin 9 CD40174 to finish.

I have to build this, but have a good feeling that I have found where I 
was looking for.

Peter
PC2A
www.pi4cc.nl