Works great. Yes, in the beginning you have to rotate the jar a lot to get what you want. Plug in a DC meter to see what you're doing. Ideal for boosting the voltage from a PC power supply! I use this as a preliminary stage for an adjustable output meter. I step up the voltage from 12V input to 30V output. The adjustable output meter can therefore reliably deliver 0-24V. Works great!
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