Debuggle Me This - Buzzing

[wheyface]

So I am working on this build that I have a PCboard of, (I'm not quite at liberty yet to say what build it is because I'm not sure if they're supposed to exist), and with it all soldered up and ready to go, when the machine i powered on, all I get is an extremely loud buzzing sound and no signal.  This seems basic enough of an issue that probably everybody but me understands.  Any hints?

https://dl-web.dropbox.com/get/Bad%20Noise.m4a?_subject_uid=118026905&w=AAB0pL1SJnd5IU7V-pxSKgTYCBODwGo2xAeMvN_Ymw4NoQ

Thanks everybody.

[Kipper4]

Go here.
http://www.diystompboxes.com/smfforum/index.php?topic=29816.0

The guys will need more info I think

[armdnrdy]

Oh yes.....just what I like.....a good mystery!

Without being able to look at whatever you posted, (the link is bad) and not knowing what you are working on, (you won't say)
I have figured out what your problem is!

But I am not at liberty to say! 

You might try posting a bit more information if you want help!
I have seen some amazing troubleshooting by forum members but.....I don't believe there are any clairvoyants among them!

[tubegeek]

I'm pretty sure I know what it is, but only for very, very small values of "pretty sure."

Having said that, you may have no connection between the effect's input and whatever you are using to drive it. That can give you a buzz-with-no-sound condition. So can a lot of other things though.

Also: move the linked file into the Public subfolder of your Dropbox folder if you want to share it.

Also: welcome to DIYStompboxes.com.

[wheyface]

https://www.dropbox.com/s/7aetipx3ujc2fz7/Bad%20Noise.m4a

So after hooking this thing up to the multimeter, you're right, there's no continuity from the effect in to the effect out.  Any good way to trace this?

I would love to give out what build it is and I'd rather not be so cryptic, but I feel a little betraying doing that.  Lets just say I opted not to use the traditional perf design

EDIT: It runs using an LDR and a few IC chips, and the IC chips are really the place I have the most trouble tracing the signal path.

[wheyface]

And thanks for the welcome guys! I'm pretty new to this stuff but my copy of Electronic Principals is coming in and I'll be on my way to understanding this stuff a little more!

[mth5044]

You want us to hear a noise and figure out what it is? OK

Get an audio probe and figure out where the guitar signal is stopping. Take voltages of the active components and use the schematic to make sure the proper voltages are getting where they need to.