buzz when using relays

[daz]

I thought i had it, hence the former "nevermind". But unfortunately i didn't. I have been using relays to sweich some sigmnals in my guitar rig for years, and i just redid the rack and not the buzz is worse then ever. It's been strabge trying to troubleshoot it. at first i thought it was the power applied to the coil even when not activated. then i discovered shielding the input jack to the rig is what fixed it. I did that temporarily with tin foil wrapped around the jack and it quieted it a lot. So today i did it properly and fully with shielding foil i got from the inside of a old amp chassis cabinet. lo and behold it buzzed whan i turned it on and i removed the foil and it buzzed the same amount. Last nite it worked, today no ! so again i tried removing the 6 volt DC power line from the coil and quiet ! So the question is, how can i eliminate the buzz the relay imparts on the signal? It's a small DPDT 6v relay with low current, i believe it draws like 20 something Ma.

[daz]

bump for new content

EDIT: now i find that it is apparently not the power from the 6 v supply. this is bizarre, but if i remove the +6v from the coil it goes away. But Thats the case even when i throw the A/C power switch for the rack to off ! with no power to the 6v adapter, the buzz comes and goes with the power wire touching/removed from the relay coil. Now it gets wierder, tho hopefully not to you guys who i'm hoping will understand.....with the power switch off and just one A/C side connected to the 6v adapter, the buzz goes away when i pull the A/C cord. Comes back when i plug it back in, even tho the whole time the A/C power switch is off and the adapter isn't getting power. (verified with meter) Using a non A/C cord with no ground plug and reversing it yeilds more noise one way, but the more quiet of the 2 was where it was anyways, so no joy there. so basically the since leg of A/C going to the adapter that supplies the coil causes buzz even tho it's not supplying any voltage. thoughts?

[daz]

Well 60+ veiws and no answer. But thats ok, i used a 100uf cap across the PSU and buzz be gone. I'd like to take this opportunity to thank myself for answering my question.

[mfreqmaster]

I thought a buzz was a good thing

[J M Fahey]

Well 60+ veiws and no answer. But thats ok, i used a 100uf cap across the PSU and buzz be gone. I'd like to take this opportunity to thank myself for answering my question.

There's serious people around here, and buzz and other grounding related problems are best answered with the chassis open, on one's own bench. (just what you did).
If you want many many answers, there are thousands of *other* Forums where they would have flooded you with them.
Would any of those have worked?
Why not? Maybe. The problem is to know which one is "the one".
Congratulations on having solved the riddle.

[Enzo]

The majority of views you see are from robot web cruisers. Places like google send robot "guests" out to thousands of forums to gather what is there. That is how your posts can show up in a google search.


The problem is that we are dealing not with a commercial product others might be familiar with and that someone like JM or I could look up schematically. We are dealing with something you made. SO we have very little to go on. COnsequently answers will be slower in coming. And some of us have been on vacation the last few days.