Menatone - None More Black  [traced]

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

Five DSG Jfets :wink:
J201 or possibly 2N5457/8/9 :?:
Jfet types and capacitor values or codes would be all that is required now to draw a schematic. :D
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Belanger88
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Post by Belanger88 »

I just posted a schematic and gut shot of the 18v version which isn't the most common
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Post by Belanger88 »

J202's are the fets actually

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Post by Belanger88 »

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Post by Belanger88 »

the NMB schematic has an error on it.. Jim discovered it a couple days ago when I was looking at the pics you sent and corrected it.. Was missing a 220k resistor to ground before the output buffer stage


ill post a new one asap
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Post by Intripped »

thanks,
...please post a pic with higher resolution

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Post by J0K3RX »

Intripped wrote:thanks,
...please post a pic with higher resolution
Try this.. Not "verified" I only traced it from the pics that Belanger88 sent me so, look it over and see if anything doesn't look right.

Big Thanks to Belanger88 for sharing your cool ass pedal! Also, for sending me the pics and getting some of the values that I couldn't see etc.. :thumbsup

This thing is a couple pots shy of a full tone stack... easy mod :wink:
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nmb schem-board.pdf
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Last edited by J0K3RX on 29 Aug 2016, 22:11, edited 2 times in total.

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Post by Intripped »

thanks JOK3RX!

i've checked the schematic against your drawing of the circuit-layout, and i've found two errors:
- at the input, 68k and 1M resistors are swapped (should be 68k in series with the signal and 1M to ground);
- at Q4 - the 1uF capacitor that is connected to the source goes directly to ground, there's no 1K resistor in series with it.

I'm checking against the pics now

edit:
ok, i've checked the pics also, and spotted two other errors:
- there's a ceramic cap, connected to ground, after the 68k resistor (that is in series with the signal) at the input - can't read the value;
- at Q3 - the 1uF capacitor is in parallel with the 1.8k resistor, and not connected to 220k/22n/470k as in the schematic and drawing.

edit2:
i've mede a mistake as well about the resistors at the input:
1M resistor (connected to ground) is placed BEFORE the 68k resistor (in series with the signal)

so, 1M res is the pulldown res against switching noise

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Post by J0K3RX »

Intripped wrote:thanks JOK3RX!

i've checked the schematic against your drawing of the circuit-layout, and i've found two errors:
- at the input, 68k and 1M resistors are swapped (should be 68k in series with the signal and 1M to ground);
- at Q4 - the 1uF capacitor that is connected to the source goes directly to ground, there's no 1K resistor in series with it.

I'm checking against the pics now

edit:
ok, i've checked the pics also, and spotted two other errors:
- there's a ceramic cap, connected to ground, after the 68k resistor (that is in series with the signal) at the input - can't read the value;
- at Q3 - the 1uF capacitor is in parallel with the 1.8k resistor, and not connected to 220k/22n/470k as in the schematic and drawing.
Ok, the 68k and 1M resistors are corrected (I blame that on copy/paste and bad eyesight) :oops:

On Q4, I believe there is a 1k8 in series with the 1u cap.. See pic attached.

You got me on the ceramic cap on the input.. I can't fully see it in any of the pics I have, I can only see that it starts with a 1.. I would say that it's pretty safe to guess that it's either 100p or less likely 10p.

Still looking at the last one you posted.
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Intripped
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Post by Intripped »

on Q4 the 1Uf it's in parallel with that 1.8k resistor,
it's the source resistor (from what i can see at least)

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Post by J0K3RX »

Here's another angle on it..

You were right on the 1u cap on Q3 source... it is in series with the 1k8 resistor. :oops: kinda makes sense now :lol:
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Post by Intripped »

err... in PARALLEL with the resistor

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Post by J0K3RX »

Intripped wrote:err... in PARALLEL with the resistor

yeah, that's what I said derrr.. parallel :slap:

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Post by J0K3RX »

Alright.. Check it :hmmm:
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Post by Intripped »

:)
looks ok to me

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Post by J0K3RX »

Kinda wondering about the 100k source resistor on Q5 ? Thinking something more like 10k to 22k may be a little better here?

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Post by onebuzz »

IMG_0241.JPG
Built one up on double sided perf using JOK3RX's schematic. Turned out very well and runs off an 18 volt wall wart. Had to use SMD adapter boards for the J202's otherwise was a pretty smooth build and it sounds the business. Thanks JOK3RX for the nice PDF schem and lay-out.
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Post by J0K3RX »

onebuzz wrote:Built one up on double sided perf using JOK3RX's schematic. Turned out very well and runs off an 18 volt wall wart. Had to use SMD adapter boards for the J202's otherwise was a pretty smooth build and it sounds the business. Thanks JOK3RX for the nice PDF schem and lay-out.
Nice work onebuzz! You find any mistakes on the schematic? Can you record any samples?

Honestly, I had never even heard of this pedal until Belanger88 sent me a PM and asked me if I would like to help him trace it.. Of course I said "Hell Yes!" but he answered a lot of my questions, supplied pictures and most important of all he supplied the pedal! So, the "Thanks" should go to him for sharing this cool ass pedal!

I've not built it but, if or when I ever do I will probably stick a full adjustable tone stack in it because I like to have more knobs :lol:

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Belanger88
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Post by Belanger88 »

does anyone have a updated working schematic for this now? also let me know if you need any info and ill take more pics and upload them so we can get it 100% accurate... then mod the balls of it
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Post by Belanger88 »

all ceramic caps are 100pf FYI guys
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