BOSS DD2 or DD3 mods for tape echo sound

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BOSS DD2 or DD3 mods for tape echo sound

Postby bajaman » 27 Nov 2007, 06:57

Hello friends
These are mods I have done on several customers Boss DD2 or DD3 pedals to obtain a more realistic tape echo sounding device.
naturally - only a tape echo sounds like a tape echo :wink: , but these mods will certainly get you closer to a tape echo sound (without the noisy and inconvenient tape loops).
the schematic can be found here:
http://www.freeinfosociety.com/electron ... php?id=126
Please note these mods apply to the original DD2 or DD3 which used the 64 pin DIP controller IC.
If anyone is sufficiently interested, I will post the mods for the later model SMD postage stamp controller IC model.
Okay - here we go :D
1: replace R14 (33k) with a 10k resistor.
2: replace R33 (47k) with a 22k resistor.
3: replace C26 (1uf 50v) with a 10n film capacitor.
4: add a 100n film capacitor in parallel with the effect level potentiometer ( between pin 1 and pin 3 of the poti)
That's it :wink: - all done :D - plug your guitar in and give it a whirl :lol:
bajaman

ps: check out that nice input buffer too. :wink:

This mod for the DD3a...
This mod for the DD3b...
Last edited by lolbou on 04 Oct 2013, 14:24, edited 2 times in total.
Reason: Added links for SMD versions...
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Postby seniorLoco » 27 Nov 2007, 07:13

now thats nice ...thanks.

i have done all kinda crazy stuff to my DD3 ....eg bleed caps to an op-amp with clippers :roll:
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Postby Isaiah » 27 Nov 2007, 16:38

Oooh, I'd be interested in trying this out on a friend's DD-3 (with their permission of course!), but I think the unit is pretty new - could you post the modes for the SMD version please?

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Postby bajaman » 27 Nov 2007, 21:13

could you post the modes for the SMD version please?

give me a couple of days - have to dig up the schematic as it does not appear to be on the web as yet :wink:
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Postby jakerandall » 27 Nov 2007, 22:36

It would be cool baja to brew your own. Lose that 4th knob, elevel, fback,delay time. Lose the mode knob, have it do up to a second maybe more. Implement the mods, improved buffer, readily available parts for a build. It might be a touch schematic but I would be interested in trying to build that.
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Postby bajaman » 28 Nov 2007, 00:59

I already have - but you will have to wait until it gets tidied up for a DIY project :lol: :wink:
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Postby bajaman » 28 Nov 2007, 08:39

could you post the mods for the SMD version please?

Here are the mods for the DD3a model - the one with the 20mm square smd controller chip :wink:

1: replace R009 (33k) with a 10k resistor.
2: replace R056 (47k) with a 22k resistor.
3: replace C051 (1uf 50v) with a 10n film capacitor.
4: add a 100n film capacitor in parallel with the effect level potentiometer ( between pin 1 and pin 3 of the poti)
That's it - all done - plug your guitar in and give it a whirl :D
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Postby DougH » 28 Nov 2007, 14:45

What effect do these changes have on the sound?
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Postby bajaman » 28 Nov 2007, 21:58

What effect do these changes have on the sound?

repeats get progressively less bassy and approach almost self oscillation at maximum repeat level - also the initial and successive echos have less high end - they no longer sound like they have just reflected off a hard sheet of steel :wink:
cheers
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Postby Meanderthal » 28 Nov 2007, 22:15

Wow, that sounds like fun! Now I wish I had one of those ...

Is there room to stuff another pot in one? If so, maybe a simple low pass filter(pot-cap-ground) might come in handy.
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Postby seniorLoco » 11 Dec 2007, 08:19

[smilie=a_goodjob.gif]
Thanks Baja ....i got my DD3 square chip much clearer repeats with your mod suggestions!! Used two diff value caps switchable :wink:
I kinda did way too many things before and got it all muddy and dark ..
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Postby sosodef » 11 Dec 2007, 08:30

what happens
to use guys without
a dd3? I agree
with baja we need
a diy project.
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Postby seniorLoco » 11 Dec 2007, 08:43

sosodef ...there are a few PT based projects aye ....do a search.
Another cool delay to muck around is the PB&j ... cheap and good! :wink:
"Curiosity may have killed the cat, but it saved the mice, who ate the cheese."
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Postby bajaman » 11 Dec 2007, 13:06

what happens
to use guys without
a dd3?

well worth buying one - there must be plenty used units out there for sale - Ebay etc. :wink:
Then do the mods and voila :lol: :lol:
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Postby Bernardduur » 11 Dec 2007, 14:33

Would this also work on the DSD-3??

Edit
To answer my own question, yes, it would work and does sound quite nice :)

The numbers are different:
DD2 | DSD3
R14 | R17 (same value)
R33 | R30; value is 33k (47k in DD-2)
C26 | C25 (same value)
'No more....... loud music.......'
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Postby The Rotagilla » 12 Dec 2007, 20:50

Do we call these the Cornish Mods or the Baja Mods? :lol:
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Postby bajaman » 12 Dec 2007, 21:14

Do we call these the Cornish Mods or the Baja Mods?

well - i do not know exactly what Pete does - and I very much doubt that he will ever tell us :wink:
let us just call them the Freestompbox mods - my gift to the community :wink:
cheers
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Postby seniorLoco » 13 Dec 2007, 08:25

Bajaman ....i will say it again ....I LOVE IT !!
"Curiosity may have killed the cat, but it saved the mice, who ate the cheese."
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Postby moro » 16 Dec 2007, 03:35

This is very cool.

I've seen the capacitor-across-the-level-pot mod before--what do the others do? I'd like to make this switchable and I probably can't fit a 4PDT in the Boss enclosure. :shock:
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Postby bajaman » 16 Dec 2007, 08:57

forget the switch - just do the mods and you will hear what they do :wink:
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