DC Socket problem

[rackham]

Hi, wondering if anyone can help me?

I've built a Vox Tonebender (the last fuzz face schematic listed on 'The Technology of the Fuzz Face' at GEO') and an op-amp Big Muff into one enclosure with 2 x 3pdt switches.

I wired it using the GGG guide at the bottom of this page:

http://www.generalguitargadgets.com/index.php?option=com_content&task=view&id=33&Itemid=27

and I'm using one of these as the DC socket:

http://www.rapidonline.com/productinfo.aspx?kw=2.1mm%20dc%20socket&tier1=Cables+%26+Connectors&tier2=Connectors+-+Mains%2fPower&tier3=DC+Power+Connectors&tier4=DC+Power+sockets&moduleno=34015

The problem is, the pedal works perfectly running off the battery, but as soon as I plug in the 9v adapter I get a hum and no sound. I've tried swapping the battery to either of the +9v pins on the socket too in case I had the wrong one. The adapter is fine as it works no problem when I tested it with my MT2.

Any suggestions gratefully received...

Cheers

Jon.

[CGDARK]

You have to isolate the DC jack from the enclosure, because if you wired it correctly you are shorting the V+ with the ground via the enclosure. That's why all we use plastic DC jacks. Try to remove the DC jack from the enclosure and connect your 9v adapter and as I said before if it is wired correctly it should work now, if not then you have a wiring problem. Try it and report back.

Good luck.

CG

[rackham]

You sir, are a legend

That'd be the problem then, took it out of the enclosure and it worked 1st time.

For my next trick I'll work out how to islolate it, time to dig out the electrical tape I reckon.

Thanks very much mate.

Jon.

[rackham]

Yup, tape on the back of it worked a treat.

Thanks again.

[CGDARK]

You sir, are a legend

That'd be the problem then, took it out of the enclosure and it worked 1st time.

For my next trick I'll work out how to islolate it, time to dig out the electrical tape I reckon.

Thanks very much mate.

Jon.

Wow, thanks for the compliment. To isolate it you can use a rubber grommet, but you will need to make the hole a little bigger.

CG

[kurtlives]

I had the exact same problem. Took me so time to figure it out, but I figured it ut non the less. I just put a bit of tape around the hole to isolate it.