This is the completed box. It houses the PWM, Voltmeter & Ammeter all in one case. This also makes a GREAT bench unit to test your HHO equipment.
I have the wiring diagram for the PWM with both the volt meter & the ammeter incorporated in it on my website.
This configuration will allow monitoring of the adjusted voltage being sent to the generator as well as the amount of amps the generator draws. By using a PWM you can make a heavy (28%) concentration of KOH electrolyte without drawing amperage which would normally fry your HHO generator.
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