Wrong pots! Oi, can these be used at all?

Started by ghostsauce, September 02, 2010, 01:26:31 PM

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ghostsauce

So, I ordered these from mouser and they weren't what I expected.  They each have 2 extra lugs on the back... All I need em' for is just a standard 3-lug pot but can I like jumper them or something?  The first one also turns 'off' if you turn it all the way counter clockwise. What on earth did I buy?




jefe

Looks like you bought a pot with a switch on it. The two lugs are probably for a spst switch. You can likely just ignore them, but you will still get that "click" when you turn it all the way counter-clockwise.

What is the mouser part number?

ghostsauce

Huh, interesting. Only one turns off though, the 100K.

  The Mouser #'s are 531-PC16SC1A-100K, and 531-PC16SV-25K.

jefe

Quote from: ghostsauce on September 02, 2010, 01:34:59 PM
Huh, interesting. Only one turns off though, the 100K.

  The Mouser #'s are 531-PC16SC1A-100K, and 531-PC16SV-25K.

Yup, according to the manufacturer's part number, the 100k has a switch. Here's the data sheet:

http://www.piher-nacesa.com/pdf/20-PC16v03.pdf

The 25k has PCB terminals instead of solder lugs, so I'll take a guess: maybe the extra two lugs are just "dummy" lugs for mounting purposes - the datasheet says something about "mounting brackets" as an option. Again, this is just a guess, but you would stick those dummy lugs through holes in your pc board, but they wouldn't be connected to anything electrically.

lazerphea

Quote from: ghostsauce on September 02, 2010, 01:34:59 PM
Huh, interesting. Only one turns off though, the 100K.

  The Mouser #'s are 531-PC16SC1A-100K, and 531-PC16SV-25K.

Dan, you avatar is pure effing genius! :D

ghostsauce

#5
lol, I saw somebody using this avatar on another DIY board somewhere.. it was too funny not to bring here. Makes me laugh every time I look at it. Cause yeah, we've all been there I'm sure XD

Anyways, I wired up my Son of screamer with these pots and it's giving me trouble. Bypass works, when the circuit's on the LED lights up, but there is absolutely no signal coming through.  And, there is a spot on the back that gets REALLY hot. Like, burned myself twice hot. It's right where R4, R5, and C5 meet: http://www.aronnelson.com/gallery/main.php/v/jdub/SOS+perf.PNG.html?g2_imageViewsIndex=1

I'll take some pics of my terrible soldering job later, kinda frustrated right now and I need to get some work done. But, if you guys can think of any reasons for this to happen, I'm all ears.