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PANEL LAYOUT, MINI'9OMB
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the blowers. The panel below is used for the
"w heel" which is a Superior 28 amp" powerstat.
The bottom panel is used for power
supply, ac switches and pilot lights,
Power Supply
A real heavy duty power supply can be
built for less than one hundred dollars. The
plate transformer was purchased from the
local power company for less than 20.00.
The rating is 5 KVA @ 7200 volts ac, This
will give around 6500 volts de un der load
for the highest voltage. 1 like to operate with
a voltage of 3700 using 100 watts d rive from
a Collins 325·1. Two 550 rnA UTC chokes
are used in the negative lead . These chokes
are in series with the swinging choke, followed
by the smoothing choke, Solid state
silicon rectifier were built up by using
48 (I amp @ 1 K. Diodes) Oil capacitors
were purchased from the power company
also, at the ra ting of 2500 AC @ 7.5 mfd.
Four units are being used giving a total of
30 mfd better than 7000 VDC at a price
85.00 per unit. A bleeder consisting of seven
10 K @ 200 watts resistors in series finishes
the power supply . In closing, I have been
using this heavy type of construction for the
past 11 years withou t a single break-down
of any part in this rig, Good DX-ing.
, . , W(1JSYK
MAY 1969 95