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DiscoverCircuits.com -- Hobby Corner
Last Updated on:
Tuesday, November 29, 2011 08:14 PM
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AC to AC Power Supplies |
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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'
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eMail David A.
Johnson, P.E. about this circuit |
