Dual 15 volt @ 3 amps / 12 volt @ 10 amps / 5 volt @ 10 amps Regulated Power Supply
After many years (30?) using a hand-me-down Philbrick +/- 15 volt 300 milli amp supply, it finally failed to the point I
didn't care to repair it. I had also been using a discarded disc drive power supply from an old graphics generator for
+12, +24, and +5. I never seemed to have the correct combination of voltages with the correct polarities and with enough current capability.
I decided it was time for something more serious. I had quite a collection of boat anchor transformers, chassis parts, binding posts etc
to be able to construct something better than what I had been using. I decided to build the Wayne-Kit 9000 Bench Power Supply.
This is a fully linear power supply and does not generate high frequency trash. The outputs are extremely clean.
This was built in the chassis of a discarded piece of laboratory equipment. The meters are self contained
digital panel meters of high quality Chinese origin. All the segments in the last digit of the center meter
work most of the time. I love that Chinese quality.
The 15 volt supplies are variable from 8 to 25 volts and .6 to 3 amps. The metering is switchable between voltage and current.
The third meter is shared between the 12 and 5 volt supplies. The 12 volt supply is variable from 7 to 14.8 volts.
The 5 volt supply is variable from 3 to 7.5 volts.
All supplies are floating and can be referenced + or - to ground or not referenced to ground at all.
The rear panel is mostly heat sink salvaged from a solid state UHF TV transmitter.
The input AC module / filter was original to the chassis.
The control circuit board was designed and built here and hides a serious piece of iron transformer.
Total weight of the unit is just over 35 pounds or 15.8 kg.
Pass transistors are mounted on the rear panel which is the heat sink.
The fan hole was cut with a 3 inch Greenlee chassis punch. This punch is a little over $100 per inch. One high output fan pushes cool air into
the unit. The second opening is exhaust.
The front panel layout is shown below. All layouts including circuit board layouts were done in AutoCad.
Cambridge Communications and Technical Services
98 Sunny Acres Road
Jeffersonville, Vermont 05464
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