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Old Sep 18, 2012, 08:48 AM
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Southern Vermont
Joined Feb 2007
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Yup there is a huge variety of home built power supplies for wire cutting. From isolated (hopefully) variacs to transformers (or battery chargers) controlled by light dimmers, fan controllers, router speed controllers, as well as PWM circuits, computer power supplies with LED dimmers, or homemade air resistors. Then there is the Lipo, brushed ESC and servo tester (or even TX/RX) route. An automotive lead acid battery can also be used.

Richie started this thread because he wanted a purchased supply, rather than one he had to build. And that actually makes choices a little more difficult than any of the above.

He's been basically looking at bench type variable power supplies -- but with an eye toward reasonable cost. With the added requirement that they be readily available in the UK. Thus Harbor Freight router speed controllers coupled with a battery charger (my own weapon of choice) are out.

The hot wire calculator was written to determine a particular wire size and type for any PSU, given the voltage range and current capacity. And for any length bow, including short formed wire cutters. Thus it can help make a decision about what purchased power supply would be appropriate.
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