The older ARRL Handbooks had a graphical solution for selecting the resistors & capacitors for voltage doublers.

Wayne

WB4OGM

-----Original Message-----
From: Rich Post <kb8tad@gmail.com>
To: n2lxm@juno.com
Cc: arc5@mailman.qth.net; milsurplus@mailman.qth.net
Sent: Sat, Apr 29, 2023 2:37 pm
Subject: Re: [ARC5] R-508/ARC Conversion

I needed a power supply for a Navy RBS and decided to build one using modern surplus junk, a pair of back to back transformers from dead UPS (putting the second transformer from an APS 350 into the empty battery compartment of the first UPS, an APS 280.) I had earlier made a similar conversion for powering an ARC 5 transmitter at QRP levels but wanted more voltage. For the higher voltage, I used a doubler on the output. It worked great for the RBS. Change resistors as needed to get the current at the voltage wanted. Here's pics of the circuit board and the simple schematic.

Rich KB8TAD

'Impoverished Experimenter' Doubler power supply schematic.jpg

On Sat, Apr 29, 2023 at 12:11 PM <n2lxm@juno.com> wrote:

Greetings All,

Has anyone converted an R-508/ARC using the article in the June
1965 issue of 73 Magazine ?. I would like to get this old girl running so
I can listen in on out local airport Automated weather transmissions.

Jeff N2LXM
Amateur Radio Operator
American
Patriot
Proud Father of Two US Marines

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