I have a small PCB, about the size of a quarter and having a Bluetooth chip on it. I have 4 wires soldered to the board. 2 of which are for a 3.7 Volt battery connection and 2 are to connect a small loudspeaker.

All of my components (PCB, battery, loudspeaker) are going to be encased in a cloth band and worn on a persons ankle. I am worried that through repetitive movement, my soldered connections will get disconnected.

Is there a recommendation for further protecting the soldered connections. I feel like wrapping it in electric tape won't be enough. Is there some kind of latex coating I can use to either coat the soldered connections or even the entire board?

I've heard of conformal coating. Is that my solution? If so which type for my case?

  • \$\begingroup\$ Instead of using a conformal coating, I'd encapsulate it using a soft urethane or silicone encapsulant, and for the wires I'd use something like this and strain-relieve them where they exit the pooky. \$\endgroup\$ – EM Fields Mar 11 '15 at 6:31
  • 2
    \$\begingroup\$ How about putting the whole thing inside heat-shrink sleeving? \$\endgroup\$ – Majenko Mar 11 '15 at 11:02
  • \$\begingroup\$ Both are great options. The heat-shrink sleeve sounds less messy. Where can I find sleeves of different sizes? Mine needs to be about 3cm in width. \$\endgroup\$ – Jet59black Mar 11 '15 at 12:41
  • \$\begingroup\$ @EMFields do you think I can encapsulate the entire PCB (except for the on/off switch on the side of the PCB of course)? \$\endgroup\$ – Jet59black Mar 11 '15 at 23:02
  • 1
    \$\begingroup\$ @Majenko any thoughts on where to find heat shrink sleeves for PCBs? \$\endgroup\$ – Jet59black Mar 11 '15 at 23:03

I've found that hot-melt glue makes a great board coating. Cheap, very easy to use, no solvents involved, sets up in minutes instead of days, excellent electricals.

  • \$\begingroup\$ If rework is needed it's also very easy to remove using denatured alcohol. Just swab the area with 90+% alcohol, wait a minute or two and the glue peels right off. It's otherwise nigh impossible to remove. \$\endgroup\$ – Alex Hajnal Oct 25 '19 at 10:37

Your Answer

By clicking “Post Your Answer”, you agree to our terms of service, privacy policy and cookie policy

Not the answer you're looking for? Browse other questions tagged or ask your own question.