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DIY Stompboxes => Building your own stompbox => Topic started by: marrstians on September 08, 2004, 03:02:51 AM

Title: what are these parts?
Post by: marrstians on September 08, 2004, 03:02:51 AM
i've seen a couple of parts lately but i don't know what they are... one looks like a resistor but just has a black band and that's it... is it just a jumper? also i have a silver, metal looking cap... the markings on it are 100 over u(backwards)22... any ideas?
Title: what are these parts?
Post by: niftydog on September 08, 2004, 03:07:43 AM
the resistors looking thing is a zero ohm resistor... or a jumper. They make 'em like that so that auto placing machines don't have to retool to place jumpers.

a backwards u? Like this ­µ? That's the symbol for "micro". And it looks like a (naked) cap without it's plastic covering?

I'm willing to bet 22µF 100V. What are it's dimensions, roughly?
Title: what are these parts?
Post by: marrstians on September 08, 2004, 03:44:10 AM
that's what i was thinking, 22uf, but it seemed a little small... it's about the same size as a normal .0xx cap... maybe 1/2 inch...
Title: what are these parts?
Post by: Ge_Whiz on September 08, 2004, 04:16:32 AM
The u replaces the decimal point, so it'll be 0.22uF or 220nF. (Similarly 1k2 would indicate a 1.2 k ohm or 1200 ohm resistor.)
Title: what are these parts?
Post by: niftydog on September 08, 2004, 07:56:54 PM
ok, revise. 220nF I guess is plausible.  half inch high cylinder?
Title: .
Post by: petemoore on September 08, 2004, 08:02:59 PM
My cap 'measuring device' [actually just a 'comparator'] consists of sockets in a working circuit...one can usually get an idea of a cap value by it's appearance or marking, then I just stick it in an input socket or emitter bypass position to see what it does in comparison to known values...works for me...being I'm not generally concerned with exacting values and know what I want or expect to hear a cap do in a given position.
  Unknown resistors values are known by measuring resistance with DMM.