Dr Boogey And Parts

[50caliber]

Hey guys, I just recently found out about the Dr Boogey pedal and I think I might give it a go.

I'm in New Zealand and its real hard to source parts like the j201, 2.5k potentiometer and enclosures etc. Does anyone know of an online shop I can buy from that has decent postage prices?
I was looking a mouser, the components were super cheap but postage it quite dear.

I will be using gaussmarkov updated Dr Boogey. Also what is the difference between the original and gaussmarkov? In the Dr Boogey it has 4 trim pots. Could someone tell me what these actually do to the sound? Is it possible to replace them with other components that don't require tweaking?

Cheers for the help guys

[km-r]

hi! your first post!

the DB is an awesome sounding pedal that REQUIRES tweaking to get all its "AWESOMENESS"...
also requires to correct layout to avoid squealing. use gaussmarkov's.
if the trimpots are adjusted far from the "sweet spot" it would sound very sterile [impotent] and not exciting.
also the bias depends on the supply voltage so a steady regulated 9v [or whatever voltage] is required.

you need those trimpots to set the drain bias of the j201's [get from aron]
for the enclosures and pots, www.smallbearelec.com

you may replace the trimpots with a fixed resistor. after you bias the fet[drain at half the supply voltage], measure the trimpot's resistance [pull it out first] and replae with a fixed value resistor, that way, you may just buy one trimpot but this strictly limits your tweaking capabilities.
different j201's sound slightly different from another j201.

hope you got that... hahah! my head spun!

[50caliber]

hi! your first post!

the DB is an awesome sounding pedal that REQUIRES tweaking to get all its "AWESOMENESS"...
also requires to correct layout to avoid squealing. use gaussmarkov's.
if the trimpots are adjusted far from the "sweet spot" it would sound very sterile [impotent] and not exciting.
also the bias depends on the supply voltage so a steady regulated 9v [or whatever voltage] is required.

you need those trimpots to set the drain bias of the j201's [get from aron]
for the enclosures and pots, www.smallbearelec.com

you may replace the trimpots with a fixed resistor. after you bias the fet[drain at half the supply voltage], measure the trimpot's resistance [pull it out first] and replae with a fixed value resistor, that way, you may just buy one trimpot but this strictly limits your tweaking capabilities.
different j201's sound slightly different from another j201.

hope you got that... hahah! my head spun!

Just what I was after cheers mate. It would help though if I could buy all the parts from the same online shop.

[ayayay!]

I just finished one, with some help from John Lyons.  The difference between the Electrictabs and Gaussmarkov's, is the Gaussmarkov layout & parts have a scaled down tonestack.  So when the original was basically copied from the Boogie, it used the amp values for all the knobs.  Also there's a few caps thrown in there too somewhere. 

I built the Electrictabs version with the original tonestack.  Some people would cry foul at that, but it worked out great for me.  Only difference was I used a 500k pot for the Volume, so that I wouldn't load the crap out of the signal.  Seems to be fine in the pedal chain, and on its own. 

That being said, stick with the Gaussmarkov version.  People are 'round here are very familiar with it so it may help when t-shooting. 

I think you should buy all 4 trimpots, and a spare in case you screw one up.  All that tweaking with your screwdriver might ruin one.  The chance is very, very low, but it's adviseable to have a spare or two on hand for any project.  I tweaked mine for about a week before I was satisfied with it, so you might not want to settle on fixed resistors too early.   

Some guys say bias to 4.5v, some say 5.5v.  Again, there's several ways to go with this pedal.  Mine biased well starting around 5.25 on all the drains, and lowering slightly here and there.  It just depends.

Also if you need a 2.5K pot:  Get a 5k pot, and place a 5k resistor across the outer lugs (1&3) of the pot.  That will get you an effective 2.5k pot.     Hint:  That's how I got my "500k" pot for the volume mentioned above.   

[50caliber]

I just finished one, with some help from John Lyons.  The difference between the Electrictabs and Gaussmarkov's, is the Gaussmarkov layout & parts have a scaled down tonestack.  So when the original was basically copied from the Boogie, it used the amp values for all the knobs.  Also there's a few caps thrown in there too somewhere. 

I built the Electrictabs version with the original tonestack.  Some people would cry foul at that, but it worked out great for me.  Only difference was I used a 500k pot for the Volume, so that I wouldn't load the crap out of the signal.  Seems to be fine in the pedal chain, and on its own. 

That being said, stick with the Gaussmarkov version.  People are 'round here are very familiar with it so it may help when t-shooting. 

I think you should buy all 4 trimpots, and a spare in case you screw one up.  All that tweaking with your screwdriver might ruin one.  The chance is very, very low, but it's adviseable to have a spare or two on hand for any project.  I tweaked mine for about a week before I was satisfied with it, so you might not want to settle on fixed resistors too early.   

Some guys say bias to 4.5v, some say 5.5v.  Again, there's several ways to go with this pedal.  Mine biased well starting around 5.25 on all the drains, and lowering slightly here and there.  It just depends.

Also if you need a 2.5K pot:  Get a 5k pot, and place a 5k resistor across the outer lugs (1&3) of the pot.  That will get you an effective 2.5k pot.     Hint:  That's how I got my "500k" pot for the volume mentioned above.   

Cheers mate, You read my mind I was just about to ask that question. So if I had a 1m pot and put a 500k resistor on pins 1 and 3 this would make it 500k?

Also the diode (d1) does the positive pin go to ground?

Thanks for the help

Edit: Also I know pots have log and linear but I don't understand why there are log pots it seems more logical to use linear as the sound would be more fluid and not change so drastically. What would happen if I changed the 1m log gain pot for a 1m linear pot?

[kurtlives]

If you have a 1M pot and want it to be 500K you would hook up a 1M resistor to lugs 1 and 3.

[ralley]

Hey 50, I've also recently moved back to NZ after 13 years in South Africa - parts are much easier to get here.  For basic parts like enclosures, pots, caps and resistors Jaycar is good.  I ordered 3PDTs and DC jacks from Effects Connection (3PDTs on special for $3.75 US vs. $11 NZ at Jaycar) shipping was less than a week to my door - quicker than local post was in SA!.  For various FET's, Opamps and BJTs I'mgoing to order from Futurelec in Aus.

Where about in NZ are you?

Rob.

[ayayay!]

What would happen if I changed the 1m log gain pot for a 1m linear pot?

Then most of the perceived sound change would occur near one end of the pot or the other, depending on how it's wired up.  Typically the first 10% of the travel would be where all the change occurs, then the last 90% would all sound the same.  Limits you a lot. 

[cpm]

I usually buy parts at local stores, and for the things not available i usually go to banzaieffects(.com) or futurlec(.com)
shipping starts to get relatively low once you are ordering 150-200$, which is not that much for a bunch of enclosures pots and fancy things.

with the boogey you may want to try some variations, you should read some interesting threads in this forum about this circuit

[50caliber]

Thanks so much for the help guys answered every one of my questions.

Just a few more though. If I have a 500k pot and I want to make it 1m how would I do this or is it only possible to scale down pots?  does it matter if its log or linear?

I can't find 2m resistors so can I put two 1m resistors in series?

Edit: also when puting the resistor over pins 1 and 3 do I just solder the resistor and the wires to the same pins?

Hey ralley i'm from auckland so I can get some parts from surplustronics and jaycar 

[WLTerry]

You can combine two resistors R1 and R2 using two equations:

If resistors are in parallel: Req = 1 / [(1/R1) + (1/R2)]
If resistors are in series: Req = R1 + R2

So:

I can't find 2m resistors so can I put two 1m resistors in series?

The answer is yes.

What you are doing with the pot and the resistor is combining both in parallel. As ayayay said: "Get a 5k pot, and place a 5k resistor across the outer lugs (1&3) of the pot", thats exactly  combining a resistor and a pot in parallel, so:

Edit: also when putting the resistor over pins 1 and 3 do I just solder the resistor and the wires to the same pins?

When you do that... you should consider the combination as a regular potentiometer with the new value. Just wire it up like a normal pot.

And:

Just a few more though. If I have a 500k pot and I want to make it 1m how would I do this or is it only possible to scale down pots?  does it matter if its log or linear?

You may put a 500K resistor and the 500K pot in series... but you cant achieve a full functionality of this new arrangement. Best thing you can do about it is get a new 1K pot.

Good luck with the Boogey, I  build it in January and I'm still amazed about this little beast... it roar like hell!!

[50caliber]

Cheers for the help guys its much appreciated.