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If you wish to test a line-powered device under both a 15% high and a 15% low voltage
condition, you can use the circuit below. The circuit uses an 18v transformer
with a 3 amp rating. A double pole, double throw toggle switch then switches in
the transformer voltage in either a buck or a boost mode. In the buck mode, the
transformer voltage is subtracted from the line voltage. In the boost mode, the
transformer voltage is added to the line voltage. With an 18vac transformer the
normal 120vac voltage is switched between 102vac and 138vac. For 240vac power line
tests, use a 36vac transformer rated at 2A.
Click
on Drawing Below to view PDF version of Schematic
