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A handful of components are responsible for the "magic" behind this circuit. Any DC source fed to V + and - as low as 5v 100ma can power these circuits. Let's say you wanted to use your laptop charger to power the coil. Average current draw from your average 19V laptop charger would be 600mA(or less) at 19V. The charger can provide about 4 amps (depending on the type of laptop charger) but in reality it needs less than one amp. So any DC source to about 30V at 1A can be considered safe with a good heat sink on the transistor.
Originally posted by solongandgoodnight
reply to post by PhoenixOD
please explain instead of just being rude. thanks.