KB6NU's Ham Radio Blog

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QRPGuys K7QO CPO a Nice Starter Kit

Posted: 09 Apr 2016 05:23 PM PDT
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The QRPGuys K7QO Code Practice Oscillator (CPO) is about as simple a kit as
you can get. The parts list includes 11 components, and four of those are
stick-on rubber feet! As you can see from the photo at right, its really
just a battery (a CR2032 coin cell, not included), a phone jack for the
key, and piezoelectric oscillator.

All told, there are only 14 solderÂ*joints to make, and about the only thing
you can get wrong is to put the oscillator in backwards. That, plus the
fact that it only costs $10, makes this a great starter kit.

The piezoÂ*oscillator is really loud, but you can add a volume control, if
you like. Instead of soldering in a jumper between two pins, you add a
50-ohm potentiometer. What I did was to simply cover up a portion of the
output port of the oscillator. That seemed to work pretty well.

Im thinking that building this kit might be our next ham radio activity
down at the Ann Arbor District Librarys Secret Lab.

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Radio Blog.