Darkglass - Tone Capsule  [schematic]

All about modern commercial stompbox circuits from Electro Harmonix over MXR, Boss and Ibanez into the nineties.
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george giblet
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Post by george giblet »

I checked the circuits using a python script.

I attached the python script as a pdf. It's pretty rough but does the job.

The results seem to match spice (frequency, dB)

# verify 1kHz 12dB
# results:
# 975 12.496385024
# 980 12.4968431225
# 985 12.4962321445

# darkglass tone capsule 500Hz 12dB
# results:
# 500 12.2289492459
# 510 12.2473715027
# 520 12.2471385698
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eqverify.py.pdf
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ATWORKSTUFF
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Post by ATWORKSTUFF »

Loving this thread. Made an account just to ask some questions. Looking to translate this to a board layout so I can built a clone or two, but I am missing some information; maybe y'all can help fill in some info? I will post my board design once it's done, of course.

From the thread, I pulled some capacitor values, but even on this list I'm not confident of all the values:
C1 22n
C2 22n
C3 120n
C4 22n
C5
C6
C7 1.5n
C8 8.2n
C9 47n
C10 47n
C11 electrolytic?
C12 electrolytic?
C13 electrolytic?
C14 electrolytic?
C15 electrolytic?


R-values all seem filled in, so no big deal here.
R1 22k
R2 22k
R3 1k
R4
R5 1k
R6 1k
R7 1k
R8 1k
R9 1.5k
R10 100k
R11 100k
R12 100k
R13 100k
R14 1k
R15
R16 1M
R17 1M
R18 1M
R19 5.1k
R20 5.1k
R21 100k
R22 10k
R23 10k

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slade
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Post by slade »

IMG_20191108_152028-1.jpg
On my board, R15, R19 and R20 are 8.25K.

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BassyTobe
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Post by BassyTobe »

Hi everyone,

first let me say thank you for all the work you've done up to now. You are awesome!
I got my hands on a Tone Capsule recently and had the opportunity to make some in-circuit measurements of the caps without any pots being connected. This version also has 5.1kOhm resistors for R15, R19 and R20
Note that these measurements may not give the 100% correct values, since sometimes there are other components in parallel. Nevertheless the rest be easy to figure out.
So here is what I've got:

C1 25n
C2 25n
C3 110n
C4 220p
C5 68n
C6 10n
C7 1.55n
C8 100n
C9 55n
C10 55n
C11 1u
C12 12u
C13 12u
C14 10u

All caps a ceramic btw.

Cheers!

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slade
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Post by slade »

Here's what I have:
Компоненты.jpg
Компоненты.jpg (48.75 KiB) Viewed 1541 times

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slade
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Post by slade »

Here's a copy that works great.
Attachments
1.jpg
2.jpg

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BassyTobe
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Post by BassyTobe »

Thanks for sharing!

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Silver Blues
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Post by Silver Blues »

Awesome!

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Alamondm
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Post by Alamondm »

Id like to build a couple of these for my basses. is V1c schematic verified?

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slade
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Post by slade »

Alamondm wrote: 07 Nov 2021, 22:14 Id like to build a couple of these for my basses. is V1c schematic verified?
Yes, it is checked. The circuit works.

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drogenbob
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Post by drogenbob »

I can also confirm that the V1c schematic works great. Although it was the first pcb layout copy and smd soldering I ever did :mrgreen:
20211029_145135_small.jpg
20211111_144639_small.jpg

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Alamondm
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Post by Alamondm »

yeah, I havent done any work with smd yet. This one may have to wait till I gain more knowledge. Not sure of the smd sizes, polarity and the diode. i noticed through holes in one of the pcbs. Is that so you can do 2 layer?

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Alamondm
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Post by Alamondm »

What is the value of D1? Is it a reverse polarity protection diode?

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