Wiring a 4-pin switch

[Omar.M]

Hello, I recently found an old VCR and decided to take the faceplate apart -- only to find a trillion little components that I could use.

I see many small push button switches, with 4 pins like you see here:
https://www.sparkfun.com/commerce/product_info.php?products_id=97

But I am not too sure how to connect it to any circuit. Let's say I have an LED, and I want to power it when the switch is pressed. Which pin would I connect the voltage too? The led? Or do I need to use all 4?

Thanks,
Omar

 

[House0Fwax]

You'll find that you have two sets of two legs joined together.
A simple check with a meter will tell you which two to use.

 

[Sceadwian]

Hopefully you have a multimeter, it's easy enough to check out exactly which leads to use using the continuity feature.

 

[HarveyH42]

If they are still soldered to the board, might look at the copper traces...