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?

PCB Assembly, PCB Design
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

What Others Are Asking

Why is wireless charging not ubiquitous?

Wireless charging is so convenient for user because it doesn’t need any wire, but it is not so popular as market. It must be some reasons in supplier side, isn’t it?

Oliver Smith October 20, 2023

Can HASL finish be used for castellated pads?

I am designing a PCB that uses castellated edges to connect to the parent board. I would like to use hot air solder leveling finish to save on costs for prototyping, but I am concerned that the non-planar surfaces of the module may pose assembly issues. Is it common at all to use HASL for castellated boards, or do I need Electroless Nickel Immersion Gold to ensure successful assembly?

Oliver Smith December 1, 2023

Why are PCB-mount AC DC converters so expensive?

I got the PCB quotation sheet and price breakdown from supplier. The unit price is not so pretty due to AC DC converters with outstanding high price, comparing to the PCB I employed wall wart. Is it normal?

Oliver Smith November 28, 2023