Από το site που έδωσε κάπου πιό πριν ο Νικηφόρος
http://www.hydrofuelsys.com/
The hydrofuelsys PCU-3 series of Constant Current Pulse Width Modulators makes it easy to control your HHO Cell. With its adjustable output and more efficient design, your PCU-3 keeps your cells running cooler and producing more gas. If you use a 12V HHO cell to make HHO and your electrolyte is too strong you get more production of gas, but you run into heat problems. If you run it too weak you don't get much heat, but your production is too low also. A Pulse Width Modulator or PWM can help control your cell so you can adjust the production. With most PWMs you can vary the output but unless your PWM is a Constant Current PWM, you still can have thermal runaway. That is why you want a CONSTANT CURRENT PWM (CCPWM) for your HHO system