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80 Amp DC Pulse Width Modulator (PWM)

SUPER POWERFUL Pulse Width Modulation DC Motor speed controller. Smoothly regulates DC loads, from 0 to 100% of power. Output level is set with the enclosed potentiometer; knob and 3 wire connector are included.
  No Longer Available ... that I can find.



Supply Voltage: 12 to 36 Volts DC
Load Current: 80 AMPS Continuously, with Resistance and Inductive loads
120 AMPS for short periods of acceleration (up to 10 sec.)
Range of regulation: PWM 0 to 100% of power
Two models are available: Fixed frequency of 1.6 kHz, and Variable frequency of 13kHz to 23kHz.
Overheating protection: When the module is overloaded, power is automatically
decreased, in order to protect the mosfet transistors from destruction.


This is NOT A KIT; this module is fully assembled as shown in the picture.
Will control loads of up to 3 Kilowatts. Comes with instructions.

Note: There are 2 connections for power, and 2 connections for load, each of which has 2 screw-down terminals. That way, 2 thinner wires or a twinline can be used, instead of a single thick wire, for each lead. And these connections are clearly marked on the bottom of the board.


If you plan on running up to 30 amps, then your PWM needs to be rated for at least 30 Amps "Continuous". That is "continuous 30 amps". That means it can be operated at 30 amps continuously without overloading and getting hot. There are a lot of 30 amperes out there on ebay - but they are not rated continuous; non that I could find.
Let me give you an example of what I mean. I use an 80 amp PWM. It is rated at 80 amps continuous. It can handle 120 amps for 10 seconds. It can handle 160 amps maximum/peak. In other words amperage can fluctuate up to 160 amps but can not stay there. The PWM can not maintain continuous operation higher than 80 amps. For protection, my PWM has a feature called Thermal Shutdown. If the current runs 120 amps for more than 10 seconds, it gets hot and goes into thermal shutdown. The mosfet transistors have to cool off before it can be used again.
So you have a few things to look for when you shop for a DC PWM. Keep in mind, it is better to have "More" Amperage capability - than to "Not" have enough.
The following specifications are a must - in my opinion:
  • Input voltage: must be able to use 12 to 15 volts dc as an input voltage
  • Amperage Rating:  30 Amps Continuous (example)
  • Maximum/Peak Amperage
  • Thermal Protection 
These features are an extra benefit:
  • Frequency Control (Meyers and Boyce used frequency to help break down the water)
  • Remote Potentiometer Control
  • Pulse Control (pulses per second)
If your potentiometer is on your PWMs circuit board, it can be removed and replaced with a remote one. Unsolder the potentiometer and solder 3 wires in its place. extend those wires to your dash. You may be able to use the old potentiometer. If not, Radioshack has some. Try to match the resistance rating; usually 10k Ohms. You can find a friend to help you with this. If not, a TV repair shop can help with the circuit board. Better yet, get a PWM that does what you want - to start with.



    Copyright 2003   All rights reserved.   Revised: 04/03/22.                                             Web Author, David Biggs
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