freestompboxes.org

This circuit was known at one time as "Freddie Fuzz".
A Fred Bonte creation.
More OpAmp distortion here.
Here's a link for more info;

http://analogman.com/blackcat.htm

Layout
https://i17.photobucket.com/albums/b72/ ... LAYOUT.png

Transfer
https://i17.photobucket.com/albums/b72/ ... ANSFER.gif

Banned of Gypsies
bajaman

bajaman wrote:Banned of Gypsies
bajaman

I thought someone would pick up on that!
Hey, ya gots ta laff.....rite?

Yeah - don't take things TOO seriously
Good to see you back again Mark - I wondered where you'd gone
bajaman

I've built this one!
Not very found of IC distortion devices but this one sounded good and cleaned up well with the gtr knob (singles mostly).
The OP275 plays a big part too, it sounded really crapy (IMHO) with others like 4558 and TL072.
cheers

snail

snail wrote:I've built this one!
Not very found of IC distortion devices but this one sounded good and cleaned up well with the gtr knob (singles mostly).
The OP275 plays a big part too, it sounded really crapy (IMHO) with others like 4558 and TL072.
cheers

snail

Agreed.
I'm no fan of OpAmp distortion either but, it seems to be one of the better sounding circuits of this type.
The OP275 seems to be required to make it sound decent.

Would you mind sending me the schematic? - benjamin.niklasson [at] gmail.com

/Ben

The Black Cat OD-1 was the very first pedal I built. I wanted one because one of my guitar hereos, Scott Henderson, was using one (Freddie Fuzz) at the time. They weren't exactly available at the music store, so I decided that I was going to make my own. That's what got me started on this DIY oddysey.

Is it just me or has anyone else noticed a POSSIBLE mistake in the Black Cat Overdrive schematics and projects on the net. I've been looking at gut shots on the net and there is a 100k resistor stretched from pin 5 to 8 of the op amp and doesn't join up to the 100uf elec and diode. The elec and diode are separted by the 430 ohm resistor which comes from pin 8 (+9v).

Like this

And This

could you post that picture, please?
edit: ups, you where faster


2nd edit: Are that two pictures of the same pcb? The "X-ray view" seems to be mirrored at least?

They are of two different boards but, each picture is the best of both sets. The boards have identical trace connections but, ever so slightly different placements if you get my drift.

Here's a couple more pics.

Sorry here they are. You can see the gap under the 430 ohm res (with the other res on the same trace/pad for the led).

Many of the "fuzzcentral-schematics" contain mistakes.
Most of them are NOT traced by Philip Bryant himself - in fact they were only redrawn by him.

This applies to the Black Cat - OD-1 too. Here is the original drawing which was made some time before Nov. 28, 2002 (the day when I saved it). Author is unknown.

analogguru

Thanks heaps for the schematic, that's awesome. It's still got the POSSIBLE mistake so I'll just have to build both ways and see the results. I'll try do it asap.

I've found some more pics that point to me being right, too busy to post links now. I am so confident I'd bet my house on it.
Anyone who has built this, from the commonly found net schematics, has built it with this little mistake (which probably doesn't affect the sound one little bit).

Also the .1 cap values are possibly wrong or some models just had a different value.

Can anybody please explain, what consequences that change would have?

I think the voltage divider would change from 4.5V to 4.49V? But does that make any difference?

ok, for the purists out there

i'm pretty confident that the mistakes on the black cat od-1 internet schematics are:

.1uf caps are .047uf
10uf electroluytic is 22uf electrolytic
and 100k resistor from Vbias joins to Vcc and 430 ohm resistor.

i have built it both ways, and both sound fine.