Skreddy - Mayo

General documentation, gut shot, schematic links, ongoing circuit tracing, deep thoughts ... all about boutique stompboxes.
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Skreddy
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Post by Skreddy »

Krinkle wrote:I'll be certain to rework it based on your suggestions. I've heard your pedals, you have great ears.

I'm still a bit shocked, so ALL ceramics? I never would have thought. I believe you if you say it though, deferring back to the comment above about your ears.

Thanks,

Darrin
Nothing but ceramics in the original triangle knobs I've ever seen. They didn't start using electrolytics or plastic film caps until later. Notice there's not even a power-supply filter/decoupler in this version?
JimiB wrote:Mark, what kind of diodes?
Diodes are regular silicon signal diodes like 1N914. I don't know the actual model numbers for the original equipment though; none of the ones I've seen had numbers I could see. I'm sure I've seen them listed elsewhere as 1N4148. This is another fertile area for experimentation, actually.

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Whoismarykelly
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Post by Whoismarykelly »

Skreddy wrote:
Krinkle wrote:I'll be certain to rework it based on your suggestions. I've heard your pedals, you have great ears.

I'm still a bit shocked, so ALL ceramics? I never would have thought. I believe you if you say it though, deferring back to the comment above about your ears.

Thanks,

Darrin
Nothing but ceramics in the original triangle knobs I've ever seen. They didn't start using electrolytics or plastic film caps until later. Notice there's not even a power-supply filter/decoupler in this version?
JimiB wrote:Mark, what kind of diodes?
Diodes are regular silicon signal diodes like 1N914. I don't know the actual model numbers for the original equipment though; none of the ones I've seen had numbers I could see. I'm sure I've seen them listed elsewhere as 1N4148. This is another fertile area for experimentation, actually.
I have done some diode experimentation with muffs and ultimately I think that EH had the right idea. LEDs can be cool but germaniums kill a ton of volume and other diode types just dont sound muffy.

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Krinkle
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Post by Krinkle »

Have you tried using twice as many Germaniums? That way instead of around .3V vs .7V, you get around .6V vs .7V. That should get you most of your volume back, shouldn't it? When I heard that the G2 used Germanium components I was certain that it would be the diodes, not the transistors. I used 2 Germaniums and got the same volume drop. I then put the asymmetrical diode configuration from the Fulltone Fulldrive and thought that it made a nice little difference in tone. I was going to double up on the Germaniums but never got around to it, I liked the Fulltone confoguration so much. Then I heard a guy play "On an Isalnd" with the Mayo on Youtube and the fact that it sounded soooooooooooo good made me think again about the effect, or lack thereof, of Germanium didoes vs Silicon. Like Skreddy said, lots of stuff to try when it comes to diodes, Silicon, Germanium, and also the use of LED's, Zener's and MOSFET's, bounding circuits, etc.

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80k
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Post by 80k »

Does anyone have a link to the Vero layout of this pedal? None of the images posted earlier in the thread seem to show anything anymore.

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Scruffie
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80k
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Post by 80k »

ahh, excellent. Thanks!

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Electric Warrior
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Post by Electric Warrior »

Skreddy wrote: But no; this won't just make a Mayo clone--you should consider it much more special than that! You can make a proper triangle-knob clone from 1971. For best results, use transistors with gains that don't go below 500 hfe and use all ceramic caps and 1/2 Watt carbon comp resistors according to the classic EH schematic; e.g...

Image

The 500pf caps are really 470pf. The 820R resistor at R5 is really 1k in the original. The .1uf coupling caps should all be rated at 200 volts (or higher) and the tone-stack caps (.004 and .01) should be 1kv for best results.
sweet. what pots should be used in this one?

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Post by theehman »

Electric Warrior wrote:
Skreddy wrote: But no; this won't just make a Mayo clone--you should consider it much more special than that! You can make a proper triangle-knob clone from 1971. For best results, use transistors with gains that don't go below 500 hfe and use all ceramic caps and 1/2 Watt carbon comp resistors according to the classic EH schematic; e.g...
The 500pf caps are really 470pf. The 820R resistor at R5 is really 1k in the original. The .1uf coupling caps should all be rated at 200 volts (or higher) and the tone-stack caps (.004 and .01) should be 1kv for best results.
sweet. what pots should be used in this one?
All the pots are 100k linear. As for the other parts values, take them w/ a grain of salt. It's not a "set in stone" schematic as I've seen triangle-knob Muffs vary quite a bit from this schematic.
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nokaster
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Post by nokaster »



very disrespectful to post MY LAYOUT in a gallery without asking permission...?

have fun with it.

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Scruffie
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Post by Scruffie »

I didn't post that? I just found the link for it and thought linking to a layout was an acceptable thing to do, plus I had no idea whos layout it was, didn't mean to offend any one, just help someone out that was looking for a layout that I had come across in my searches.

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nokaster
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Post by nokaster »

Scruffie wrote:I didn't post that? I just found the link for it and thought linking to a layout was an acceptable thing to do, plus I had no idea whos layout it was, didn't mean to offend any one, just help someone out that was looking for a layout that I had come across in my searches.

my comment was aimed at whoever posted the layout in the gallery...

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Scruffie
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Post by Scruffie »

Ah sorry, my mistake.

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Post by Gila_Crisis »

i just finished a new BM following this schem:
Image

it's a personal mix on triangle/ram's head/green russian (the coloured values are mounted on switches).
i first tryed it with some BC183B and i was surprised how good it sounds! really better than my old ones, really thick and musical, and with a bit more of volume reserve.
i also tried it shortly with some BC239C but i didn't noticed any particular differences.
today i managed to measure the tranny's hfe and to my surprise the readings are:
BC183B
335-339-345-309

BC239C (here's something strange, why those values are so low?)
345-354-355-357-348-365
Zwischen Ordnung und Chaos fangt die Musik an

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L_Z_Nut
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Post by L_Z_Nut »

Got my mayo clone done. Thanks to John Lyons at DIYSB for the PCB, and thanks to SpencerPedals for the layout.

Image

Image

Un-altered pic of the flake
Image

Altered to see more
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PCB
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Thanks to this site for providing me with the info to build this pedal.... sounds great!

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sfx
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Post by sfx »

Nice paint job, what type/brand is it?

I've been looking for a nice metal flake orange enamel locally and am not having much luck.

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Post by L_Z_Nut »

I'm not sure... I got from a guy on another forum.

My guess is that it's a pre-drilled premium color pedapartsplus enclosure.

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sfx
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Post by sfx »

Ah, that would be powdercoat in that case. Looks good regardless.

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80k
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Post by 80k »

Well I finally got around to putting this together, and it is a fantastic Muff. My only other Muff build experience was an old Tonepad layout, and I can't remember what version it was (but i remember using 2N5089's). But i did try BC239C and BC183C (and will likely try 2n5089 and BC550C's later this weekend). I seemed to get slightly higher output with the BC183C. Right now I have a mixture of BC183C and BC239C and it is sounding real good.

Comparing it to the Foxey Fuzz, I still don't know which one I like better. But they do share some very positive things in common. First, both do very well with the darker tones without sounding muddy. Also, they both reach insane levels of sustain when gain is maxed out. I definitely like the Mayo better for lead, especially with the neck pickup of my Strat. I'm going to have to spend a few weeks comparing the Mayo and the Foxey.


Here's my board. I'm doing a triple pedal with Zvex Machine, ProCo Rat, and Skreddy Mayo. This will encompass my 3 favorite distortion/fuzz circuits into single DD size box!
Image

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SpencerPedals
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Post by SpencerPedals »

That is badass. I have all three of those pedals as well and have to say that a three-in-a-box setup of those is a really great combo...so much noise from just one box.

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Post by Gila_Crisis »

80k wrote:I seemed to get slightly higher output with the BC183C.
that's the same felling i have on mine (althought i used BC183B), there's more output than with other transistors
Zwischen Ordnung und Chaos fangt die Musik an

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