How can I electrically isolate a PCB from a heat sink?

I have a set of LED driving lights for motorcycle that must be wired through a ground-leg pulse width modulation dimmer. The problem is the mounting bracket for the lights is grounded, so the lamp shorts to ground through the motorcycle chassis and the PWM dimmer cant dim the lamps. How do I handle this problem?

December 5, 2023

Use Kapton tape
Use Sil-pad and shoulder washer. If you use a sil-pad the screw will still electrically connect the componet tab with the heat sink, soashoulder washer should be used to isolate the screw and the tab.

Oliver Smith

Oliver is an experienced electronics engineer skilled in PCB design, analog circuits, embedded systems, and prototyping. His deep knowledge spans schematic capture, firmware coding, simulation, layout, testing, and troubleshooting. Oliver excels at taking projects from concept to mass production using his electrical design talents and mechanical aptitude.

Oliver Smith

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How can I electrically isolate a PCB from a heat sink?

Oliver Smith

Oliver Smith

What Others Are Asking

What does “run a panel” mean in the context of PCB/PCBA fabrication?

Is there any problems if I change 0805 too 0402 surface mount or smaller?

Is there a surface-mount component I can put on a pad, that simply has another pad on top that I can solder something on to?

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