[GreenKeys] Model 15/19 power supply 120VDC

[Harold Hallikainen]

Sounds like a lot of work! I suspect the transformers would cost more than
a complete supply from:

RTTY Electronics, P.O. Box 20101, El Sobrante CA 94820. Phone +1 510 222
3102. Email mr_rtty at pacbell.net.

Here are the supplies I know about, and the prices several years ago when
I bought a upplies

Loop Supplies

152950 150ma $20.00 - This is the supply I am using on a local loop. It is
a small open metal chassis with a transformer, a couple silicon diodes,
and a capacitor. It has a D-hole that accepts an HKP fuse holder. I added
a fuse holder, 1A 250V slow blow fuse, a line cord, and a terminal block
for the DC output. When driving the loop, the voltage is 125 VDC. A 2.2k
10W resistor sets the loop current to about 60 mA. The voltage across the
resistor is 122.7 VDC for a loop current of 55.8 mA.

162361 500ma $30.00

REC29 200ma $35.00

Good luck!

Harold
https://w6iwi.org

On Mon, March 2, 2026 5:10 pm, Johannes Eggers wrote:
> I'm building a 120VDC power supply for my frankensteined Model 15 / 19.
> The plan is to take 3 transformers with 28V secondaries in series, gets me
>  84VAC, then a rectifier and maybe smoothing capacitor.  I'm not sure
> about the VA rating for the transformers.  I calculated 7.2VA for the
> current loop (60mA * 120V DC), but I'm not sure about the perforator.
> Anyone have
> numbers for that?  Also, am I missing something?
>
> Thanks !
>
>
> Johannes
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