grounding problem??

[vendettav]

hey guys, i was building a metal simplex.. went thru a lot of shit haha but whatsoever. what i got now is the whole pedal is working fine only that when i turn the vol on my guitar to 0 i get this hum... i think i missed some grounding... any ideas what could cause it?? the problem is with the pedal on only!!

[familyortiz]

I suggest getting a multimeter to check all your ground connections. It's a very quick exercise that can be revealing.

[vendettav]

ok i do have a multimeter... how do i test the ground with it?? sorry im new to a multimeter

[familyortiz]

Set the multimeter to OHMS, usually shown as the greek letter omega (horseshoe lookin thing) to measure resistance. If you hold the probes together, you will see a value close to 0, which means low resistance of a short circuit. This is about the value you should see if you put the probes across any 2 ground points. If one ground point has a bad connection, it will show as a higher resistance or no value at all if it is completely disconnected from ground.
Give this a try and see if any ground point is not behaving, including connector grounds and pc board grounds.

[vendettav]

Set the multimeter to OHMS, usually shown as the greek letter omega (horseshoe lookin thing) to measure resistance. If you hold the probes together, you will see a value close to 0, which means low resistance of a short circuit. This is about the value you should see if you put the probes across any 2 ground points. If one ground point has a bad connection, it will show as a higher resistance or no value at all if it is completely disconnected from ground.
Give this a try and see if any ground point is not behaving, including connector grounds and pc board grounds.

thanx man.. ima check it out right away

hey also could anybody help me with testing hFe on trannies???

[familyortiz]

hey, many of the newer meters actually have a small 3 sockets to measure this.  pretty cool!

[vendettav]

hey, many of the newer meters actually have a small 3 sockets to measure this.  pretty cool!

yeah so does mine but i just dont get how to use it. also what if its on the schematic already?? ive heard they dont use those sockets much