DiscoverCircuits.com, has 30,000+ electronic
circuits, cross-referenced
into 500+ categories. We have searched the web to help you
find quick design ideas.
We make every effort to link to material posted by the designer.
Please let us if you would like us to link to or post your
design.
The contents & graphics of
Discovercircuits.com are copyright protected.
LINKING to Dave's circuits is permitted but DO NOT COPY any files to your WEB
SITE server
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.
Click on Drawing Below to view PDF version of Schematic
