Here is my reversed job...
I did this quickly but my feeling is that it's mostly accurate with the info available. I'm too lazy to figure out all the caps and some orientations may be reversed in my haste to put this together. Anyway, have fun with it.
Here is a partial parts list
Partlist
Exported from CoolCatDrive.sch at 2/23/09 3:18 AM
EAGLE Version 5.4.0 Copyright (c) 1988-2009 CadSoft
This new schematic is missing R4, another 10K.
R3 and R4 are connected in series between Pin 1 and Pin 5 of IC1.
Diodes D1 and D2 and C1 are connected to the junction between R3 and R4.
C1 is 1nf.
C4 and C5 are 220pf.
C8 is 100nf.
audiohub wrote:This new schematic is missing R4, another 10K.
R3 and R4 are connected in series between Pin 1 and Pin 5 of IC1.
Diodes D1 and D2 and C1 are connected to the junction between R3 and R4.
C1 is 1nf.
C4 and C5 are 220pf.
C8 is 100nf.
thanks audiohub,
I have made the changes and have updated the schematic as well as acknowledged your contribution.
there has been some confusion, mainly on my part, as to how R3+R4 are laid out. Here is a high resolution pic to show it. Thanks to audiohub again. I had to make a third rev to the schematic. Practice makes perfect . This fits with what the OCD and voodoolab now. The junction of R3 and R4 from pin 1 to pin 5 should have the connection to D1/D2 combo. Feel free send comments
I'm interested in it, please, what did you exactly change?
I changed C9 to 68nf, C3 to 1uf tant, C12 to 47nf, and replaced the clipping diodes with 2n7000's (plus diode on one). I also removed the output buffer by removing C11, C13, R13 and the 100k tied to the output, and jumpered the wiper of the output pot to the out jack connector. The whole process took about half an hour, and the connectors make it easy to remove the board to mod it.
IIRC, the 9V supply does not go in series through the diode as shown. The diode (1N4004) is connected from supply to ground for polarity protection, and a 100uf and (probably) 100nf cap are tied from supply to ground for filtering. I didn't remove any of the tiny SMD caps to measure them, but might this weekend. I'm guessing that with so much else of the circuit copied, these are probably correct values. A nice feature for the SMD electrolytic caps is that there are connected through holes underneath them when you remove the caps, making for easy replacement with through hole parts. Nice!
I didn't have a SMD TL082, so I left the stock TL072 installed for now. I've noticed a number of people here claim the the 082 is a key component of the OCD sound, so I'll order some soon to replace it and see for myself. I may also try replacing C8 at some point with a multilayer ceramic.
just thought i'd follow up on this to see if you had any luck trying out a TL802 in this circuit or any other mods
just thought i'd follow up on this to see if you had any luck trying out a TL802 in this circuit or any other mods
I did order a few SMT TL082's and tried one in this pedal, along with changing the rest of the signal caps to mutilayer ceramics to mirror the OCD. To my ears, it made a small change towards the better (cuts a bit more) and I've kept it this way.
An even better mod was replacing the 12K filter resistor with a 50K trimmer (Bournes 3362 which was easily glued on the board edge where I could adjust it while listening). This allowed me to select a filter adjust point for the front panel tone knob that worked best with my setup.
The pedal sounded great right out of the box, and even better now (to my ears, anyhow) for under $30! It's a keeper.
In the current Guitar Player magazine issue there's a test about 39 pedals, the Dano Drive is among them.
The article says it hasn't such an inspiring distortion tone and it doesn't clean up well rolling back the guitar volume.
Given the fact the Dano IS a OCD clone (and my ears seem to confirm it, 100%), why did they give an editor's award to the Fulltone pedal sayng that it had great tone and a good dynamic too with the volume knob?! !!!
It makes me laugh, but I'm a bit worried about the real value of these tests and reviews.
nooneknows wrote:In the current Guitar Player magazine issue there's a test about 39 pedals, the Dano Drive is among them.
The article says it hasn't such an inspiring distortion tone and it doesn't clean up well rolling back the guitar volume.
Given the fact the Dano IS a OCD clone (and my ears seem to confirm it, 100%), why did they give an editor's award to the Fulltone pedal sayng that it had great tone and a good dynamic too with the volume knob?! !!!
It makes me laugh, but I'm a bit worried about the real value of these tests and reviews.
Seems they were listening with their eyes. And of course, GP reviews are worthless anyway. It's all about sucking up to their advertisers.
I have both a Drive and a V1 OCD and there is little difference in tone and dynamics between the two. I know TGPers will flame roast anyone who makes this claim but I dare them to pick out the real OCD in a blind test.
I heard them both, side by side, and the only difference I've really found is the pots taper, so equal positions make a slightly different sound. But the character overall is there, I'm quite sure about it.
I am new to this forum but i like it a lot already.
I was wondering if its possible to run the danelectro coolcatdrive at 18 volts like many people do with the Fulltone OCD?
Or will any damage be done?