My fuzz pedal project is behaving badly - diyAudio
Go Back   Home > Forums > Source & Line > Analog Line Level

Analog Line Level Preamplifiers , Passive Pre-amps, Crossovers, etc.

Please consider donating to help us continue to serve you.

Ads on/off / Custom Title / More PMs / More album space / Advanced printing & mass image saving
Reply
 
Thread Tools Search this Thread
Old 18th April 2012, 03:25 AM   #1
diyAudio Member
 
Join Date: Jun 2011
Location: Hobart Australia
Default My fuzz pedal project is behaving badly

Hi all.

Hopefully a simple fix. I have a fuzz face PNP type circuit. it works really well with a 9v battery, however when I use a 9v plug pack problems start.
The issue is this. I have a single plug pack driving multiple devices. When all dc is plugged in it works (power to the devices in the chain). When I plug a 1/4" phono from fuzz to the little 9v amp input, power is cut. this happens with all devices in my collection. I had a thought that it is because of the positive ground the circuit has, but i cant work it out. no hair left too pull out.

cheers.

Luke
Attached Images
File Type: png originalpnpfuzzface.png (2.6 KB, 22 views)
  Reply With Quote
Old 18th April 2012, 10:00 AM   #2
diyAudio Member
 
Join Date: Jan 2012
If you want to run it all from one supply youll have to convert your fuzz face to the NPN version (reverse the capacitors etc) or stick to using the battery . You cant ground the positive in one unit and the negative in another , run off the same supply rails then connect the 2 grounds together either accidentally or on purpose as you are shorting the positive to the negative ..............see ....fuzz face help .....thread in Instruments and amps for some related info .

Last edited by epicyclic; 18th April 2012 at 10:08 AM.
  Reply With Quote
Old 18th April 2012, 12:03 PM   #3
Simon B is offline Simon B  United Kingdom
diyAudio Member
 
Join Date: Dec 2011
Location: North-East England
I do remember seeing, some time ago now, an effects psu advertised with eight, independent, floating, 9v outputs, rather than the usual one.

This had two possible uses: Allowing positive ground effects, usually a pnp fuzzface to be connected, and elimination of ground loops. Not sure who made it.
  Reply With Quote
Old 18th April 2012, 09:44 PM   #4
diyAudio Member
 
Join Date: Jun 2011
Location: Hobart Australia
there are few companies out there that do them, what i don't like about them is they bring mains voltage to your feet. In live music situation this is hazardous (beer spillage, punters throwing water and so what at you) generally I like to keep all mains voltages on the back line.

I have in mind to make one that takes a plug pack power supply, say 24v (this is voltage requirement of one of my pedals) then split it out into and 18v and several 9v outputs. still thinking about it really not committed to sit and build yet.

cheers
  Reply With Quote
Old 18th April 2012, 09:49 PM   #5
Simon B is offline Simon B  United Kingdom
diyAudio Member
 
Join Date: Dec 2011
Location: North-East England
If one of your pedals needs 24v, either AC or DC, then I think you're going to run into the same problem, in a different guise if you start trying to derive other supplies from that.
  Reply With Quote
Old 19th April 2012, 12:41 AM   #6
diyAudio Member
 
Join Date: Jun 2011
Location: Hobart Australia
yeah, you are right! I dont understand enough currently to begin solving this problem.
The is obviously a way, others have done it.
  Reply With Quote

Reply


Hide this!Advertise here!
Thread Tools Search this Thread
Search this Thread:

Advanced Search

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off


Similar Threads
Thread Thread Starter Forum Replies Last Post
How to get good Fuzz from a Guitar-amp project. stigla Tubes / Valves 23 27th August 2012 12:28 PM
LM337 behaving strange??? deduikertjes Power Supplies 19 22nd June 2012 12:52 AM
Help with mis-behaving Cambridge 540A J Wiggle Solid State 20 30th May 2012 04:54 PM
CDM2/10 Behaving Badly Dave S Digital Source 71 26th May 2010 10:52 AM
Fuzz Face DIY: need more fuzz ThomasDIY Instruments and Amps 12 17th September 2009 03:06 AM


New To Site? Need Help?

All times are GMT. The time now is 01:56 AM.


vBulletin Optimisation provided by vB Optimise (Pro) - vBulletin Mods & Addons Copyright © 2014 DragonByte Technologies Ltd.
Copyright 1999-2014 diyAudio

Content Relevant URLs by vBSEO 3.3.2