01270 747 008 (UK)

Power Pulse Modulator – PWM-OCm

Miniature PWM Circuit for low voltages

DC to 100kHz, Adjustable Frequency, 0% to 100% PWM Duty, 8A Current, Switching Voltage up to 75V


16 in stock (can be backordered)


The PWM-OCm is an ultra miniature power pulse width modulation control circuit. Despite its tiny size the PWM-OCm is capable of controlling a large amount of power which makes it great for embedding in your projects without taking up space. The PCB can also be screwed to a suitable heatsink to improve the power handling capabilities of this device. 

The OCm is primarily designed for use in low voltage projects such as DC motor speed control, electrolysis reaction rate control, light bulb or LED dimming and strobe effects. It has a very low on-state resistance which allow for efficient control of power at voltages below 75V. If you need a device capable of withstanding higher voltages, take a look at the PWM-OCmi. You can switch mains powered devices by adding a Solid State Relay to the output.

DC to 100kHz, Adjustable Frequency, 0% to 100% PWM Duty, 8A Current, Switching Voltage up to 75V


It has a range of onboard components for dealing with transients and voltage spikes caused by noisy loads like motors. This allows the device to run with high performance levels even when in a demanding environment. Also included is a built in thermal shutdown feature which will disable the PWM output if the switching transistor is too hot. The output is automatically restarted once it has cooled again.

The PCB contains four connector pads at the perimeter which allow the device to be enabled, or interrupted from another signal source, or even another Power Pulse Modulator. They also allow for monitoring the onboard oscillator, or modulation of its frequency.

The compact design is built in the UK on a high quality dual layer PCB with 2oz copper (twice as much as standard circuits) for durability and performance. The high quality, low cost PWM-OCm is ideal for embedding in your projects due to its small size and adjustability. The onboard timing capacitor is fitted in a socket on the PCB so that it can easily be changed for producing other frequency ranges.

Please note: Printed manuals are not supplied. Please download or print the manual using the link below.



Input Voltage(DC) 12 – 30V
Max Switching Voltage 75V
Max Continuous Current 8A*
Frequency 0 – 100kHz**
Duty 0 – 100%
Footprint(mm) 45 x 50
  • Thermal Overload Protection
  • Fully assembled and tested before shipping
  • See manual below for full details and specifications

Need a different spec? Customisation available from £25

Example Applications

• LED or Light Bulb Dimming and Strobing
• Electrolysis and Electroplating
• Motor Speed Control
• Laser Pulse Experiments
• Resonant Energy or Magnetic Pulse Experiments
• Tone Generator and Ultrasonic Driver
• Hot Wire Cutting or Heater Control
• And more…

For full details and specifications – Download the PWM-OCm Instruction Manual


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