What did I build? Help me identify

[cab42]

I was going through my box of abandoned circuits in order to find a Hogs Foot I once built.

However, the board I thought was the Hogs Foot, was something Else, but I don't know what.

I drew a schematic from the vero I built it on. It looks familiar but I have searched and searched and haven't found anything



It looks like some kind of booster or od/fuzz. The first pot meter was actually a 100k lin with a 32k resistor across so I guess i did not have the right value. The volume  pot in the end is a qualified guess. It was just a wire. The transistor was a 2n5088, but It could be that I just followed R.G. Keens second law: if in doubt, use a 5088

Any ideas?

[GibsonGM]

Very close to the output (recovery) stage of a Big Muff!   The input looks like a 'pre gain' control.  Maybe to be fed with another gain stage or distortion that may output a hot signal?

[PRR]

LPB, modded.

[Mark Hammer]

I agree with Paul.

[antonis]

I agree with Sir Mike..

[Marcos - Munky]

Big muff's last stage and lpb are the same but for part's value. The biggest differences are that lpb resistor from base to V+ is 1M, while bm's is 390K-470K, and the resistor from emitter to ground is 390r on lpb and 2K7 on bm. Output cap on lpb is 100nF, while bm's is 100nF-1uF.

So you have basically a bm recovery stage. The first pot looks like some kind of filter.

[GibsonGM]

I think it could very happily be BOTH!! 

[cab42]

Thanks for the replies.

They triggered my otherwise leaky memory, and I am now pretty sure what it is.

It was an attempt to make a tone control for a JFet Vulcan, consisting of a Stupidly  Wonderful Tonecontrol and a gain recovery stage. I think I nicked the gain stage from the late Ricky Vance's heavy metal pedal, but it had a BMP tonestack.

It was before I got my first breadboard, so I had to put anything on a board in order to experiment. Apparently it did not work out well as it ended in the box and was replaced with a bmp tonestack.

So it was:

So you have basically a bm recovery stage. The first pot looks like some kind of filter.

Now the only mystery left is what happened to the Hogs Foot I was looking for to start with.

Thanks again

[Marcos - Munky]

Apparently it did not work out well

Yeah, you got a few things at the wrong place. This looks like swtc3 (http://www.muzique.com/news/stupidly-wonderful-tone-control-3/), but you got the resistor and cap at the wrong place and with the wrong values on a power of 10 (cap should be 47n and resistor should be 2k2, that will work but the cut will be at a different frequency than amz's). Easy to solve it - if you want to.

Now the only mystery left is what happened to the Hogs Foot I was looking for to start with.

You can easily adapt this one to be a Hogs Foot. Remove everything from the swtc part. Use 3.3uF as the input and output cap. Replace the 100K resistor with a 39K one, and the 2K2 resistor with a 390r one. Add a 100nF cap in parallel with the 10K resistor and another one from base to ground. You can use this schematic as a reference: http://fuzzcentral.ssguitar.com/schematics/moleschem.gif. Well, it's probably easier to just build one from the start 

[cab42]

Marcos,

Thanks for the comments.

Yeah, I noticed the errors as well (except for the power of 10). It was a build from my early "career" as a hobby builder, and as such I am not surprised that it did not work.

I want to run the Hogs Foot in parallel with a Bass Fuzz in order to blend in some clean signal. I'm afraid that the clean signal will drown in the gain of the Bazz Fuzz without a booster on the clean signal. I believe it will also fix phase issues as well. I think I'll build the HF on breadboard first. If you saw my vero, you wouldn't try to mod