I built and used a KX1 a couple of years ago.
I used a Radio Shack 273-1680 power supply. It's a variable supply with
selectable voltages: 3, 4.5, 6, 9, 12 V. at 1 ampere.
Wish I hadn't traded the KX1-- I had a lot of fun
with it.
73,
Chuck Guenther NI0C
K2/10 s/n 5853
K3/100 s/n
1061
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