Monday, April 19, 2010

Crud buckets!

I have the AA0ZZ keyer just about finished except for the decal/label and one other little detail.

I thought I was all finished with construction - plopped the three AAA batteries in, only to have the keyer give out a stream of constant "3"s. It turns out that the momentary push button that I have for keyer memory three is a "normally closed" switch instead of "normally open". I didn't quite catch that as I was rummaging through the junk box at the Hamfest last week. Looks like I will have to go to Radio Shack tomorrow evening and buy a package of "normally open" ones. Gosh, I hope they have some!

72 de Larry W2LJ


  1. Can you take a 2N2222, put something like a 1k resistor from +12V to the base, put the switch on the base to ground, the emitter to ground, and the collector to the keyer to invert it?

  2. That would undoubtedly work; but another trip through the junk box paid off and I found the last remaining switch that I needed!