A 150 amp max. Pulse Width Modulator,  P150 from Central Valley HHO
with current limiting capabilities. Comes all soldered up ready to wire up and install.

Specifications
Input voltage .................................... +12 to +18 VDC
Max continuous output current ............ 110A
Max repetitive peak current ................ 600A
Operating temperature range.............. -25 to +85 *C
Current regulation............................. >100:1
Frequency Range (+/- 10%) ............... 1KHz-10KHz
and guaranteed to keep on working, if hooked up correctly.

Introduction
What's the benefit of this device?

Let's start with what a PWM is not. A PWM is not a magic device that is likely to provide any great gains in production over straight DC. It is not designed to provide resonant tuning such as Boyce or Meyer toyed with. While both of these devices use similar technology, there's much hocus-pocus in their designs. Personally, I have yet to see or hear of a working replication of either design that produces any amount of HHO close to what is claimed for them.

A true PWM is just an electronic switch that turns on and off at a very fast rate of speed varying the percentage of time on vs. off. To the load it appears smooth because it's so fast, just like our vision can barely detect the flicker of a fluorescent bulb even though it goes completely off and back on again 120 times a second. The duty cycle of a PWM is the percentage of on-time vs. off-time.

HHO electrolyzers naturally draw more current as they warm up. All brute force electrolyzers will warm up, even the most efficient ones. At the end of a day current can be easily three times as much as what you started with at the beginning of the day. Without a PWM the problem becomes finding the correct electrolyte concentration for an entire day of driving. If you start out weak then production is very slow to start out with and you lose the benefits until much later in the day. If you start out strong enough to see benefits right away, by the end of the day you're blowing fuses or greatly stressing your alternator.

With a current limited PWM you set your electrolyte for the target operating current at the beginning of the day. To start the output duty cycle is nearly 100%. Half way through the day as the cell is getting warm it may want to draw twice as much current from straight DC. The PWM, sensing that twice as much current is flowing every time it switches on, rolls back the duty cycle to 50%, thus maintaining the same average current. At the end of day when the cell wants to draw three times as much current the PWM is operating at 33% duty cycle. See a video showing this PWM.

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