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DiscoverCircuits.com -- Hobby Corner
Last Updated on:
Friday, December 29, 2017 05:52 AM
Hobby Circuits List
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AC to AC Power Supplies Variable AC Power Supply Circuit
designed by David Johnson, P.E. In electronics, it is
often handy to have a fully isolated variable AC power supply. With such a
device you can safely test various AC powered circuits and even probe around in the
circuit with an oscilloscope.
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The hobby circuit below was designed to provide up to
500 watts of AC over a range of zero volts to over 250vac. For safety, it is
designed with two separate outputs. One output ranges from zero to about
140vac. The second output ranges from zero to over 250vac. Different
sockets are used, so a standard 120vac device can’t be accidentally plugged into the
higher voltage socket. An AC volt meter and an AC current meter could be
included if desired as shown in the photo below. A three position left off
toggle switch is uses on conjunction with a power relay to route power to the
appropriate socket and to switch power from the two 250 watt isolation transformers. |
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Click on Drawing Below to view PDF version of Schematic |
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AC to AC Power Supplies
Hobby Circuits List
eMail David A.
Johnson, P.E. about this circuit |
