Fulltone - OCD  [traced]

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

Do you experience a lot of bass with version 4?
I built it on mark m's layout, just folowing the schematics. Is this normal? When I tried other versions,, it didn't have so much bass.

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sinner
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Post by sinner »

I know it's traced, but maby some of you would like to have it, it is v4

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bolidin
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Post by bolidin »

Da Cat wrote:Do you experience a lot of bass with version 4?
I built it on mark m's layout, just folowing the schematics. Is this normal? When I tried other versions,, it didn't have so much bass.
hi
try this
C2 22n or/ and
C1 10n and /or
c8 47n or/ and
c11 100n

1 and 2 are pre saturation filters and 8 and 11 post

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cacophony
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Post by cacophony »

sinner wrote:I know it's traced, but maby some of you would like to have it, it is v4
Hmmm... Multilayer Ceramics... Based on my experience, those caps give you a darker tone as compared to metal films, which produces more brightness and crisp sound. I wonder why Fuller used this type of cap. :hmmm:

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quaternotetriplet
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Post by quaternotetriplet »

@caco

tinipid. Lol

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plugzzzz
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Post by plugzzzz »

cacophony wrote:
sinner wrote:I know it's traced, but maby some of you would like to have it, it is v4
Hmmm... Multilayer Ceramics... Based on my experience, those caps give you a darker tone as compared to metal films, which produces more brightness and crisp sound. I wonder why Fuller used this type of cap. :hmmm:
quaternotetriplet wrote:@caco

tinipid. Lol

syempre pano sya kikita kung mamahaling pyesa gagamitin nya :D :D :D

i doesnt matter it works well...

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quaternotetriplet
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Post by quaternotetriplet »

:hug:

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Geosh
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Post by Geosh »

Quick question, I built the Vero per the layout and I am getting a wierd effect when the gain is cranked past about 3 o'clock. With the gain cranked, the signal cuts in and out and sounds like a distorted tremolo sort of. Any ideas where to look?

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susomora
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Post by susomora »

Hi guys . This is my first post in this awesome forum , so be gentle on me ...
I have a couple questions :
1) Having read so many references to the Shaka OD , how come only one of the MOSFET clippers is paired with an external diode (1N34) on the OCD ?
2) has anyone tried a good old TS with MOSFET clipping?... Impressions ?
Thanks in advance .
Suso

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gian80
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Post by gian80 »

Hi folks,

I'm not familiar with this stuff, anyway my V1.4 has 3 transistors and 3 diodes ( I think 2 x 1N4002 and 1N34A). I see marked on the PCB C12 too instead of 11 caps. Now why that schematic is different? Cuz the real thing runs up to 18V and this not? If it's not the answer why the schem is different? Just to understand.


Gianluigi

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plugzzzz
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Post by plugzzzz »

gian80 wrote:Hi folks,

I'm not familiar with this stuff, anyway my V1.4 has 3 transistors and 3 diodes ( I think 2 x 1N4002 and 1N34A). I see marked on the PCB C12 too instead of 11 caps. Now why that schematic is different? Cuz the real thing runs up to 18V and this not? If it's not the answer why the schem is different? Just to understand.


Gianluigi
extra transistor/caps/diode that are missing is just for the led switching for spdt... i guesss they ditch those because 3dpt was use instead

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95strat
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Post by 95strat »

Can anyone tell me which caps are ceramic and which one is the tantilum?

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newly
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Post by newly »

Yellow cap (C8 ; with a plus in the silkscreen) is Tantalum.
The blue cap are multi dip, sometime they are sold in yellow color like the tant as well.

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95strat
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Post by 95strat »

newly wrote:Yellow cap (C8 ; with a plus in the silkscreen) is Tantalum.
The blue cap are multi dip, sometime they are sold in yellow color like the tant as well.
I meant in the schematic. I should have been more specific.

I'll answer my own stupid question. I'm building the MarkM OVD version and C3 and C6 are ceramics. I should have known this because of how small their values are. I believe C10 is suppose to be a tantalum.

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95strat
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Post by 95strat »

I got mine up and running. I just have a couple of trouble shooting questions if anyone is willing to help. Should be pretty easy for folks around here.

My build is based on the MarkM OVD layout
Image

1. The tone pot is wired with lugs 2 and 3 to the board, but 1 is left off. Should I tie lug 1 to lug 2? Or do I need to ground it some where else?

2. I'm not getting full range on the drive pot. I put in a 1 meg Alpha instead of B500K like the newer version. I didn't know if that was effecting the range. Or maybe it the fact that I put a 1uF tant in at C10.

3. On the drive pot I just wired lug 1 to ground. It works, but I want to make sure that's correct.

I have a TL072 in it for now. It seems to be darker than my current OCD. I'm guessing it's a combination of that and having film caps instead of multi dip caps Fuller uses.

Thanks for the help in advance.

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chriscustom
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Post by chriscustom »

C9=0,001mf=1000pf

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95strat
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Post by 95strat »

chriscustom wrote:C9=0,001mf=1000pf
which = .01uF

Are you referring to the above layout? Not getting the point?

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Post by chriscustom »

95strat wrote:
chriscustom wrote:C9=0,001mf=1000pf
which = .01uF

Are you referring to the above layout? Not getting the point?
See C10

Image

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95strat
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Post by 95strat »

C10 is correct on my board. It's a 10n cap.
Last edited by 95strat on 30 Dec 2009, 20:43, edited 1 time in total.

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chriscustom
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Post by chriscustom »

95strat wrote:Ahh, so C10 is a non-polarized cap valued at .01uF. How does this correspond to the MarkM layout? Is it C9? Let me double check.
Image

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