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Ken, a pot (on it's own) is really only suited to regulating very small current loads (a few milliwats) (e.g. a led). Pots that would be suitable for regulating a 10 watt or 20 watt load would be large, wire wound and generate lots of heat at the same time as wasting power (of concern when running from battery power) The DSE PWM circuit is simple, if you can solder, then you should be able to easily put one (or more) together. The circuit board is pre-made and there will be instructions showing you every component's place and orientation. I'm sure you are capable of doing it.
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