low profile momentary switches NC - source?

[JTEX]

Littelfuse or Coto Technology. You'll find them on Mouser, Digikey etc. I wouldn't trust any electronic component from Amazon or any other site that doesn't specify the manufacturer and part number, with a datasheet available.

NC reeds are extremely uncommon. I think you'd be better off finding a way to work with a NO. You might want to try biasing a NO reed with a fixed magnet so it stays closed, and when the moving magnet comes in, it cancels the field and causes the reed to open.

Pro tip: if the magnet is perpendicular to the reed, you need to aim it at one of the ends, not the centre.


See this:

https://cototechnology.com/library/appnote/reed-switch-tech-app-info.pdf

 

[lcipher3]

Littelfuse or Coto Technology. You'll find them on Mouser, Digikey etc. I wouldn't trust any electronic component from Amazon or any other site that doesn't specify the manufacturer and part number, with a datasheet available.

NC reeds are extremely uncommon. I think you'd be better off finding a way to work with a NO. You might want to try biasing a NO reed with a fixed magnet so it stays closed, and when the moving magnet comes in, it cancels the field and causes the reed to open.

https://cototechnology.com/library/appnote/reed-switch-tech-app-info.pdf

Thanks for the info. Yeah the NC doesn't really seem generally available. I've seen the bias approach, or if the geometry works just move the magnet "away" during actuation to get the opening.

 

[lcipher3]

Thought I'd posts this pics of the TAYDA momentary closed (NO) switch insides. Pretty simple. After carefully drilling out the pins this is the guts. You could turn it into a magnetic switch pretty easy. The holes are about 0.100" (2-56 screw size) and the black plastic housing you could use to hold / glue a reed switch in position.

Or hack it to be a NC by adding some kind of contacts - not sure how well it would last. That last pic actually "works" - the strips are trapped by the the silver contact pieces and make contact.