inside sobbat drivebreaker 3 - gut pics

dubs · February 15, 2005, 08:00:00 AM

Here are some gut pics, a cousin of a tubescreamer/fulldrive??

sir_modulus · February 15, 2005, 08:09:23 AM

Looks nice! (wow...that's cool, they use a 1590BB...like really! no Tiwanese (usually most peeps use these, as they have no logo inside)). Thanks for the guts shot!

Cheers,

Nish

mrsage · February 15, 2005, 04:27:15 PM

Very cool!

What does the DB-1 look like?

Joep · February 15, 2005, 05:56:56 PM

Is this the pedal the Edge (U2) is/was using... ??

Thanks,

Joep

mrsage · February 15, 2005, 07:27:47 PM

Quote from: JoepIs this the pedal the Edge (U2) is/was using... ??

Thanks,

Joep

He uses/used the DB-1.

dubs · February 15, 2005, 07:29:15 PM

I believe the Edge uses DB-1 distortion like in elevation - I'll do gut shots of that,

Rob Strand · February 17, 2005, 05:01:57 AM

The cap values would be useful.

Joep · February 17, 2005, 04:18:52 PM

Here it is.....

PDF

or....

Gif

Rob Strand · February 17, 2005, 04:41:54 PM

Looks good. I printed out the pics and traced it on the train trip home, no time to draw it. Pretty much got the same thing - haven't checked it.

Minor differences:
- Can't see the input resistor R1
- Boost/drive pots only use two terminals
- There's an electrolytic cap across VCC
- There's a zener on the leds, and two of the electro caps are use with the LEDs.

puretube · February 17, 2005, 04:58:30 PM

wow: 3 voltage followers...

Joep · February 17, 2005, 05:00:25 PM

Hi Rob,

Have a look at this pic:

You are right about the pots. The way I draw it is electrically equal, and I like this way better....

Added the cap, and made some other changes. It's V1.1 now

I left out the led part.....

Daz, can you help us out on R14 and C14??

PDF
Gif

dubs · February 17, 2005, 05:42:19 PM

Damn you're quick,
c2 is 1uf
you left out c12 100uf

definitely worth building, sounds great!
I look up others when I get home tonight

Joep · February 17, 2005, 05:56:32 PM

Hi Daz,

I already fixed these issues. The version I send you is old already, just download the new version.

Bye,

Joep

toneman · February 17, 2005, 07:03:45 PM

more diodes 2 gnd.
this time LED's
mucho buffers 2!!

Rob Strand · February 18, 2005, 02:01:13 AM

Joep, thanks for overlay (and the schematic). I found R1 just after posting this morning, it *is* there - sorry for the delay in replying.

The schematic looks right but I'll cross-check again with my trace. I couldn't make out some of the cap values on the print out, especially the polyesters - will try to check "on screen" this weekend.

QuoteYou are right about the pots. The way I draw it is electrically equal, and I like this way better...

Yeah, it is better.

Interesting that same PCB is used for the bass overdrive version as well. The DB-1 and DB-2 look different, at least from a controls point of view.

Rob Strand · February 18, 2005, 10:41:22 AM

Joep, I checked over your schematic and found these errors:

- R8 (47k) missing on schematic. Goes between Drive pot and opamp -ve input
- IC2 has parts A and B swapped from the PCB
- The wipers of the Drive and Boost pots actually connect together (they connect at the middle of that part of the ckt) Basically flip the Boost Pot Left Right.
- I'm pretty sure the LEDs are 3mm orange. I checked this on a DEL 19" LCD which usually has good colour rendering (the Yahoo girl looks nicer as well), still looks orange on my CRT.

As far as the guess cap values go. There's enough ambiguity not to guess. Only a few cap values are actually visible. (I think R14 is 100k but it's a guess.)

Joep · February 18, 2005, 11:23:55 AM

Hi Rob,

Thanks for having a look.

Quote- R8 (47k) missing on schematic. Goes between Drive pot and opamp -ve input

OK, I added this one.

Quote- IC2 has parts A and B swapped from the PCB

Sure? I still think it right....

Quote- The wipers of the Drive and Boost pots actually connect together (they connect at the middle of that part of the ckt) Basically flip the Boost Pot Left Right.

I coorected this too

Quote- I'm pretty sure the LEDs are 3mm orange. I checked this on a DEL 19" LCD which usually has good colour rendering (the Yahoo girl looks nicer as well), still looks orange on my CRT.

Daz, you have seen it. What's you opinion? And how about C14 and R14.

I updated the schem's to V1.2

PDF
Gif

Rob Strand · February 18, 2005, 05:17:02 PM

QuoteSure? I still think it right....

Sorry Joep, not sure why even I thought that at the time - both traces match here.

Despite my confused minds your v1.2 schematic looks spot on.

StephenGiles · February 18, 2005, 05:32:56 PM

Great drawing. How much different does this sound from a Rat? The circuit is not a million miles from it!
Stephen

Joep · February 18, 2005, 05:56:45 PM

You can find some soundsamples here:

http://www.musictoyz.com/guitar/pedals/sobbat.php

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inside sobbat drivebreaker 3 - gut pics