Frantone - Peach Fuzz

MoreCowbell · Post by **MoreCowbell** » 05 Oct 2007, 20:10

I sent a bunch of pics to AG a while back, but I know he has a lot more important things to worry about these days...

Unfortunately I dont have "wiring" photos (and I can't remember the name of the guy who sent these pics to me....) , but these should get us close. We'll just have to make an educated guess about the pot values and wiring.

I already flipped the trace side photo.

Have fun.

bajaman · Post by **bajaman** » 05 Oct 2007, 20:20

I will have a go at it - unless someone else is already doing so - no need for duplication
cheers
bajaman

MoreCowbell · Post by **MoreCowbell** » 05 Oct 2007, 20:24

bajaman wrote:I will have a go at it - unless someone else is already doing so - no need for duplication
cheers
bajaman

I know AG was working on it, but that was a while ago.

I'd do it, but I just don't have time these days.

bajaman · Post by **bajaman** » 05 Oct 2007, 23:47

Well - here is what i got so far - feel free to correct or add to it
cheers
bajaman
https://i197.photobucket.com/albums/aa2 ... schem1.jpg

MoreCowbell · Post by **MoreCowbell** » 22 Oct 2007, 02:08

Thought I'd bump this...

MoreCowbell · Post by **MoreCowbell** » 22 Oct 2007, 02:11

bajaman wrote:Well - here is what i got so far - feel free to correct or add to it
cheers
bajaman
https://i197.photobucket.com/albums/aa2 ... schem1.jpg

Interesting. Definitely a bit different then the standard opamp fuzzes. Clipping multiple 386's ...

bajaman · Post by **bajaman** » 22 Oct 2007, 04:29

Hi Andrew
Any idea where the collector of the 2N5088 goes? , and how about that pulldown 1 Meg resistor ain the inverting TL022 gain stage - pretty weird stuff - they only used one half of the 022 too

bajaman

MoreCowbell · Post by **MoreCowbell** » 22 Oct 2007, 17:38

bajaman wrote:Hi Andrew
Any idea where the collector of the 2N5088 goes? , and how about that pulldown 1 Meg resistor ain the inverting TL022 gain stage - pretty weird stuff - they only used one half of the 022 too
bajaman

It looks almost like the collector connects to the white wire jumper, and then to the grey wire (V+ ???)

Strange pedal. I used to have one...I wish I still did so I could confirm some of these things.....

bajaman · Post by **bajaman** » 23 Oct 2007, 05:49

I am assuming the 1k resistor goes to the led indicator light which is connected to +9v, the same as the schematic for the Frantone Sweet ( yet another big muff) pedal previously posted on DIY Musikding - but what the hell is the 2N5088 for ???, and where does that grey wire ( connected to the white wire??) from the collector go????.
weird
bajaman

pz · Post by pz » 23 Oct 2007, 15:30

bajaman wrote:I am assuming the 1k resistor goes to the led indicator light which is connected to +9v, the same as the schematic for the Frantone Sweet ( yet another big muff) pedal previously posted on DIY Musikding - but what the hell is the 2N5088 for ???, and where does that grey wire ( connected to the white wire??) from the collector go????.
weird
bajaman

The base of the 5088 is connected via 10k||10u to the switch. I'd say that this is a kind of popping eliminator. Attach the collector to some voltage via resistor, just for simulation. When there's a change in the footswitch state, a short impuls to ground is generated by 5088, probably used to mute the signal for a while, to cut out the pop. Engl used something similar in their preamp switching. Just my guess...

bajaman · Post by **bajaman** » 23 Oct 2007, 18:55

thanks pz, I realize it is only a guess onf yours, but I still cannot see how that would mute the signal.
I must check the Engl schems I have - what value resistor would be appropriate for the collector load and why is it not on the circuit board??
bajaman

super velcroboy · Post by **super velcroboy** » 30 Nov 2007, 11:26

hi guys,
I'm enjoying this site a lot.

I took some photos of my peachfuzz tonight. They are VERY high resolution

I'm too busy right now to reverse engineer it myself. When i get a chance, i'll give it a shot. Tell me if you guys need anything

Keep up the good work!

http://farm3.static.flickr.com/2420/207 ... 6af5_o.jpg
http://farm3.static.flickr.com/2313/207 ... e7f6_o.jpg
http://farm3.static.flickr.com/2269/207 ... 81db_o.jpg
http://farm3.static.flickr.com/2129/207 ... 7a33_o.jpg
http://farm3.static.flickr.com/2089/207 ... bdb5_o.jpg
http://farm3.static.flickr.com/2282/207 ... eb86_o.jpg

bajaman · Post by **bajaman** » 30 Nov 2007, 11:38

thanks

bajaman

~arph · Post by **~arph** » 30 Nov 2007, 15:07

Does this thing do On/Dead silent switching so when the pedal is not engaged you actually hear nothing at all? otherwise can someone explain the DPDT switching as wired here to me?

Post by **audioguy** » 30 Nov 2007, 15:28

super velcroboy wrote: I took some photos of my peachfuzz tonight. They are VERY high resolution

Yes they are!!! Yikes.. nice pics!

super velcroboy · Post by **super velcroboy** » 30 Nov 2007, 17:42

you guys think you have enough to render an accurate schematic?

snail · Post by **snail** » 30 Nov 2007, 17:48

Thanks velcro boy!
there are 3 resistors under the wires that we can't see. Any chances of getting a shot lifting the wires a bit, or even telling us the colours they read?
Same with pot values! I could only read the 10K one.
Thanks again!

snail

analogguru · Post by **analogguru** » 30 Nov 2007, 18:50

Nice photos, nice resolution.... a quarter of the resolution would also giv good results....

Hmmm.... Christmas is coming.... and I would like to see some shots from the directions marked in yellow:

I think with this shots I should be able to finish the schematic and a lot of people could get happy.

analogguru

super velcroboy · Post by **super velcroboy** » 30 Nov 2007, 20:09

yeah, okay. When i get home today, i'll see if i have time to open the pedal up again and mark the values of the components.

@analogguru -- can't you just flip the trace pic over and superimpose the two together?

analogguru · Post by **analogguru** » 01 Dec 2007, 00:27

super velcroboy wrote:yeah, okay. When i get home today, i'll see if i have time to open the pedal up again and mark the values of the components.

that would be fine....

@analogguru -- can't you just flip the trace pic over and superimpose the two together?

Here is a mirrored pic of the track side (from another guts)
http://analogguru.an.ohost.de/temp/Fran ... rror_c.jpg

My procedure of tracing is as following:
1.) to make a black/white printout of the mirrored trackside.
2.) mark tracks and eyelets in turquios
3.) draw the components manually in different colors (resistors: pink, semiconductors: orange, capacitors: green)
4.) during 2 and 3 look for ground and V+ and mark those tracks in darkblue and red
5.) After finishing this: trace the schematic from this drawing

As you can see, for the reason of my procedure I dont have experience in superimposing 2 pictures together... sorry

analogguru

Frantone - Peach Fuzz [traced]