Help with Dr. boogey

[bamera]

There seems to be a problem with my Dr. B when fed by a singnal from my AMZ Jfet Splitter.

When i plug the guitar into the Dr. B without passing through the Splitter, there is no noise whatsoever..the output distortion is fantastic, no complaints. The problem is when I plug the guitar into the Splitter and the Splitter output into the Dr. B..... the distortion comes out of the DR. B mixed with annoying RF and noise.

Just to clarify, the AMZ splitter has 3 outputs and fed by a 9v regulated power supply. With exception to the Dr. B, the all three Splitter outputs are working perfectly with every pedal I´ve tried (All commercial bought).
The Dr. B is also fed by 9V regulated power.

The Dr. B and AMZ Splitter are in metal cases, no leds, no switches, just input, output and Power input.

Why is the Dr. B outputting junk when fed by the Splitter? It sounds phenomenal when I plug the guitar straight into it. 


In a few words.....The AMZ Jfet Splitter and the Dr Boogey work Great in every scenario seperately but when used together there is RF and noise.

Hope someone can lend a hand ,

sincerely Daniel C

[jlullo]

i'm not necessarily the person who should be answering this, as i've never built a Dr. Boogie myself, but I swear I can remember reading that the Dr. B is prone to RF noise, especially when being fed through a power supply because it is such a high gain circuit

anyone else better versed in this circuit care to chime in?

[dschwartz]

the amz splitter has shared ground for all the outputs.. if you're sharing the same supply, it is possible that a big ground loop turns in...

on the other hand, it is possible that the splitter is feeding some RF noise into the boogey..the splitter has a very high input impedance and very low output impedance.. and no RF protection that i recall..so try putting a small cap to ground at the input of the dr boogie to  eliminate any RF coming into the circuit (try 100, 220, 330pF till the RF noise is low enough)

PD: did you use gaussmarkov´s layout?.. the older one (electrictabs) is more prone to pickup RF noise and hiss.

[bamera]

Jlullo & dschwartz

Well, the power supply is regulated but I found that the problem is in the Dr. B. It´s no a ground loop issue because the RF was still there even when I used a battery. Strange that my other pedals hooked up to the splitter work great.
Anyway, I decided to build another Boggey and found that my original build had a few (Quite a few actually ) wrong parts...Sounds super heavy now and the mid pot actually does something now.

The RF noise is still there but much reduced in this new build....I can live with it..

Thanks again guys, Daniel C

[frank_p]

Anyway, I decided to build another Boggey and found that my original build had a few (Quite a few actually ) wrong parts...

If you're not too shy writing your errors down on the topic could help some others.  Or best, make a build report.

http://www.diystompboxes.com/smfforum/index.php?topic=64140.0
http://www.diystompboxes.com/smfforum/index.php?topic=64141.0

13) PAT YOURSELF ON THE BACK - OK, your pedal works...smile, play around with it for a day or two, and then be sure to submit a "BUILD REPORT" here on the forum. In your build report, be sure to include what gear you're using the pedal with, what kind of music you play, what troubles (if any) you had building it, your experience level of building, what you like about the pedal, and what you don't. Basically, let everyone know all the things that YOU would have liked to have known BEFORE you built your pedal.

14) IN CASE IT DIDN'T WORK - Read the "Debugging..." thread HERE, get all the necessary information, and start a thread about it. People here are generally able to help, but they need information to do so. Be sure to include voltage readings, a link to the schematic and layout that you used, and make sure to list any part substitutions that you may have used.