BOSS DD2 or DD3 mods for tape echo sound

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bajaman
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Post by bajaman »

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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seniorLoco
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Post by seniorLoco »

now thats nice ...thanks.

i have done all kinda crazy stuff to my DD3 ....eg bleed caps to an op-amp with clippers :roll:

Isaiah
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Post by Isaiah »

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?

Cheers!

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bajaman
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Post by bajaman »

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:
bajaman

jakerandall
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Post by jakerandall »

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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bajaman
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Post by bajaman »

I already have - but you will have to wait until it gets tidied up for a DIY project :lol: :wink:
bajaman

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bajaman
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Post by bajaman »

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
bajaman

DougH
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Post by DougH »

What effect do these changes have on the sound?

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bajaman
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Post by bajaman »

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
bajaman

Meanderthal
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Post by Meanderthal »

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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Post by seniorLoco »

[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 ..
"Curiosity may have killed the cat, but it saved the mice, who ate the cheese."

sosodef
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Post by sosodef »

what happens
to use guys without
a dd3? I agree
with baja we need
a diy project.

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seniorLoco
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Post by seniorLoco »

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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bajaman
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Post by bajaman »

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:
bajaman

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Post by Bernardduur »

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)
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The Rotagilla
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Post by The Rotagilla »

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

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bajaman
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Post by bajaman »

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
bajaman

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seniorLoco
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Post by seniorLoco »

Bajaman ....i will say it again ....I LOVE IT !!
"Curiosity may have killed the cat, but it saved the mice, who ate the cheese."

moro
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Post by moro »

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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bajaman
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Post by bajaman »

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

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