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Power Supplies /
Converters: AC to AC Power Supplies -- Main
Page Last Updated on:
Monday, October 03, 2011 06:07 PM
Circuits Designed by Dave
Johnson, P.E. :
VARIABLE ISOLATED AC VOLTAGE SPANS 0VAC TO
280VAC
I designed and built this circuit about 25 years ago. It came in handy for many
projects that were powered from 120 VAC, 240 VAC and 277 VAC. It provides complete
isolation from the power line. It uses two 1:1 isolation transformers that are
wired in parallel for the140vac range and in series for the 280vac range. The
selector switch also diverts power to the appropriate output socket to avoid
mishaps in sending the wrong voltage to the load. My home-built unit also included
an AC volt and amp meter to monitor the output. However, this circuit only
indicates the AC power connections.
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