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Old 08-10-2014, 08:47 PM   #61
Dave
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This is one of the best things that's been done on this board in terms of pedals!
I can't wait to make a clone myself!
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Old 08-10-2014, 09:13 PM   #62
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A little donation for the schem seems fair. Not a cheap pedal to buy, then the risk of degooping...
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Old 08-10-2014, 09:15 PM   #63
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Quote:
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A little donation for the schem seems fair. Not a cheap pedal to buy, then the risk of degooping...
If he wants it, I'll give what I can. Although without a job I doubt it would be much

But he has definitely taken a big risk and done us a great service
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Old 08-10-2014, 09:34 PM   #64
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Has the switch been confirmed as a dud?
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Old 08-10-2014, 10:48 PM   #65
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Wow, thanks for the support guys!

I'm not going to ask for any donations. I think I feel bad in doing so just yet because I haven't completely done the job at hand.

The switch is most definitely not a dud. After finding out all the connections last night, they connect to lug one of both distortion pots (the distortion pot is a dual pot). It is connected to some resistors on the board. Today I'll try and finish off the schematic and see if it can make any sense.

I've hit the point now too where I don't need to touch the pedal again, except to get the values of the distortion potentiometer and maybe just double check values if I think they are wrong (one 15k resistor and one 22uF cap has me a bit stunned but it may be right)
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Old 08-10-2014, 10:58 PM   #66
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Old 09-10-2014, 01:07 AM   #67
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Okay... I'm going to put up the unconfirmed schematic. If you have knowledge in this, please let me know if you see any errors, there may be some.

There may be errors with the part numbering but the values are correct (with the exception of that 22nF cap but I assume that's right also)

(The dist dual pot may be 500k, not sure)



EDIT: Seems to be all dat Big Muff Pi

Quote:
It's a big muff variant after the first two transistors.

I don't recognize the circuit for the first two transistors (Q4 and Q5 in the schemo, I think), but it seems vaguely familiar. I'd have to do some analysis or simulate it to do more than that.

Odd booster in front of a big muff pi clipper/amplifier.
tl:dr. It's a germanium based distortion(?) that goes into a half BMP stage without diodes, then going into a modified BMP with a slightly different tone section and an unusual recovery stage.

The fact that it's germanium means that other "clone" available is probably not making terribly much off of it.

Also, I might take people up for donations if they like. I'll sort that out soon.
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Last edited by Crowella; 09-10-2014 at 06:18 AM.
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Old 09-10-2014, 08:16 AM   #68
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After discussion with a pedal builder who also has an animato, we agreed its a NTE102/NTE103 pairing. Doesn't explain the strange biasing but I'll double check that.
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Old 09-10-2014, 09:54 AM   #69
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I don't have a lot to give but I'd certainly donate something too.
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Old 09-10-2014, 10:32 AM   #70
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For thy toan, the BigSky, and the morning glory are yours for now and for ever.
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Old 09-10-2014, 10:36 AM   #71
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I am thinking about simulating some stages of this (mainly the weird first stage and the tonestack) circuit to get an idea about the frequency response and stuff but i am not really sure what kind of germanium model can i use instead of the NTE102s. Would something like an AC128 could be good in place of the originals?
Also it is probably time to do a preemptive NTE102 buying spree on ebay, the remaining stock will fly off the shelves faster than ebola masks once somebody starts selling PCBs of this thing.
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Old 09-10-2014, 10:41 AM   #72
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If you could simulate it, that would be absolutely fantastic!

I think an AC128 would slot in there but not sure what to pair it with. I'm in a situation where I can't figure out what to use in place of both of them because they don't exist here or they cost obscene amounts ($10 each!)
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For thy toan, the BigSky, and the morning glory are yours for now and for ever.
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Old 09-10-2014, 10:49 AM   #73
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If you could simulate it, that would be absolutely fantastic!

I think an AC128 would slot in there but not sure what to pair it with. I'm in a situation where I can't figure out what to use in place of both of them because they don't exist here or they cost obscene amounts ($10 each!)
I will try the first stage up to the Dist pot A with whatever small signal germaniums biased to 6.8V and will see what happens.

edit: Imgur folder here with some sims, maybe it should be reposted at diystompboxes.

http://imgur.com/a/sgWgS
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Last edited by Don'tPostThePear; 09-10-2014 at 11:50 AM.
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Old 09-10-2014, 12:15 PM   #74
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Reposted!

Awesome. I'm really not surprised by how much bass it's removing. I'd be so tempted to whack different caps in to get more bass through. I wonder if it's to compensate for the BMP stages later on?

Anyway, Board B has a PCB. I'll PDF it all when it's done. Also, over 1100 views on my album. Gee, didn't think there was THAT much of a market for it.

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Our father, Who art in Strymon, Metal Zone be thy name; Thy toan will come; Your klon be done; On stage as it is in bedroom. Give us this day our daily song. And give us our telecasters, as we forgive those that cannot impress us. And lead us not unto buffers, but deliver us true bypass.

For thy toan, the BigSky, and the morning glory are yours for now and for ever.

Last edited by Crowella; 09-10-2014 at 12:19 PM.
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Old 09-10-2014, 12:48 PM   #75
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Quote:
Originally Posted by Crowella View Post
Awesome. I'm really not surprised by how much bass it's removing. I'd be so tempted to whack different caps in to get more bass through. I wonder if it's to compensate for the BMP stages later on?

Anyway, Board B has a PCB. I'll PDF it all when it's done. Also, over 1100 views on my album. Gee, didn't think there was THAT much of a market for it.

Nice PCB!

Sometimes it helps to cut bass before a massive distortion to keep things more defined and clear but it seems pretty big. I have never heard this circuit with a guitar, maybe that is why it sounds bad with a guitar?

I added some tonestack simulations, it does not look very convincing, maybe i screwed up something or there was a mistake on the schem.
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