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What Is A PWM?

What is PWM?

Pulse-Width Modulation is the process of rapidly switching a circuit between 0v and battery voltage. Rapidly switching the voltage on and off creates a square wave, which leads to a more stable output voltage. A few examples are: Murata, Raptor, Evolv and YiHi. For a more in-depth explaination of Pulse-Width Modulation click here.

pwm board

What is the benefit of using PWM?

The benefit of using PWM is the ability to regulate the time that the circuit is on vs off or vice-versa. A good comparison of this is an LED light with adjustable brightness. When fully dimmed, the onboard PWM would be pulsing slowly, but as you turn the brightness up the pulsing gets faster which results in voltage being applied for longer amounts of time. In other words, it’s a way of adjusting “voltage” with a potentiometer instead of a more complicated system like a DNA or SX board. It should be understood that any time the button is pushed, the full voltage of the battery is present across the coils, the switching happens many times per second.

Why does my mod whine or buzz?

Electronic switching is noisy in all applications, especially when unfiltered. The frequency in which most boards run is within the audible range for most humans.

Why wont my voltmeter read correctly?

Mainly this is due to the oscillation of the voltage, voltmeters generally want a flat input voltage and not one that is oscillating many times per second.

2 thoughts on “What Is A PWM?

  1. How complete is your $120 Slim Triple 18650 “NO LEAN” Pick Your Color? Does it have a Master On/Off? Is it protected by a Resettable Fuse? Does it have Reverse Battery Protection? Will it allow me to reach 300W Safely with 0.48Ω? Dos it have a MOSFET, and if so, which one? Does it have a Voltmeter? Can I get these things if not?

    Why would I want PWM? Can I set an Output Voltage with that? Would there be a Buck/Boost DC-DC Converter inside? The only reason I would want it would be to set a 12V output (or whatever). Three 18650s would not be above 12V for long, so I don’t think that PWM alone could do that. Right? Again, I want to reach 300W Safely with 0.48Ω (that needs 12V & 25A).


    1. We don’t do volt meters. There is not one out that i have found that is good or lasts, many come in DOA. As for the Fuse we also do not use them in our mods but we can place a master on off in the mod if you like. and no on the pwm if you read through our What is a PWM page it will explain how it works. Other than that i hope this answers your questions. Thank you for the comment.

      Also the mosfet we do not give full detail out on them because most people misunderstand what they can really handle and will push them till they stop working.

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