For operation with an alternating current power source, the power circuit can be provided with a power conditioner for regulating the voltage and amperage of the discharge current, and {HEAD ~ a selectively adjustable frequency regulator} for regulating {TAIL ~ the frequency} of the discharge current 
for regulating
For operation with an alternating current power source , the power circuit can be provided with a power conditioner for regulating the voltage and amperage of the discharge current , and { HEAD ~ a selectively adjustable frequency regulator } for regulating { TAIL ~ the frequency } of the discharge current
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