Modded Fab Echo

[MartyMart]

I finaly have a Fab chorus/echo/OD on the way
Let's see what fun there is when they arrive !!

[funkbass187]

i'm thinking of getting a FAB echo and doing that mod with a switchable LDR to sort of be like a pseudo expression pedal. does turning the pot while in the midst of playing stop the echoes or anything?

[MartyMart]

Just about to mod the Fab Echo and mine has a full size PT2399 in it !!
The pin 6 delay time resistor is on the reverse of the board and the layout is a little changed
should be easy enough to get to though .
MM

[oldrocker]

I have a question.  If the noise associated with the PT2399 is inherent to the chip, does the FAB suffer from this noise also like the Rebote?  If it's strictly an echo and not delay then the delay is too short for the noise to be heard I assume.

[MartyMart]

I'm not familiar with the Rebote's problem, I assume that it's "aliasing" noise from pushing the chips
delay time a bit too far ?
Data sheet recommends a 50k delay pot and max delay of around 300msec - perhaps at this setting
it's going to operate fine !
MM.

[oldrocker]

Yes Marty that's pretty much what I was thinking too.

[unknowndude]

Just modded my fab echo, sounds great :

[dirk]

I have the Fab Echo modded to.

And I have given it 100% feedback so it selfoscillates now.
I have the SMD version.
The middle leg of the repeat pot goes to a brown capacitor. The capacitor is then connected to a 4k7 smd resistor, witch makes up the feedback path. I just bypassed the 4k7 resistor with a solder blob and that did the trick.

Now I only need a 100% wet setting, so only the delay is heard.
It anyone knows how to do that and is willing to share: Let us know.

@Oldrocker: The fab Echo has noise issues, but only at very long delay times (+-300ms or more).

[unknowndude]

thanks for the tip on getting it to osscilate. It still sounds fine and doesnt osscilate on lower settings, right?

[aron]

Wow this mod seems cool. I need to try it. Like the lofi repeat sound.

[unknowndude]

Okay, did the feedback mod and it works. You can get some crazy sounds, and of course dial back the feedback and get normal delay sounds.

Clips:
(normal delay, going through modes)
http://www.megaupload.com/?d=5QQKFRWS
(osscilation)
http://www.megaupload.com/?d=YT6EFKFJ

[tommy.genes]

Cool clips.

That MegaUpload site had opened a popup without me noticing and started playing some "data a celebrity" video with dialog and music. At first I thought it was part of your clip. With the delayed guitar parts over top, it sounded kinda arty / dubby cool.

-- T. G. --

[Scotty Did]

dude I am totally gonna take you up on that.  and While I'm at it I'll show you my toaster amp I built

[Uma Floresta]

Okay, did the feedback mod and it works. You can get some crazy sounds, and of course dial back the feedback and get normal delay sounds.

Clips:
(normal delay, going through modes)
http://www.megaupload.com/?d=5QQKFRWS
(osscilation)
http://www.megaupload.com/?d=YT6EFKFJ

That sounds amazing! I have to try this.

I want to rehouse the whole thing. Anyone know what the values on the two stock pots are (the mix and repeat controls)?

[chris_d]

Okay, did the feedback mod and it works. You can get some crazy sounds, and of course dial back the feedback and get normal delay sounds.

Clips:
(normal delay, going through modes)
http://www.megaupload.com/?d=5QQKFRWS
(osscilation)
http://www.megaupload.com/?d=YT6EFKFJ

I like the way the Fab Echo sounds!

I did a similar mod to its bigger brother, the Dan Echo that has been a lot of fun to play with. In the Dan Echo the resistor that needs jumpering is R10.

I did some quicky clips of it a while back that are here: http://www.soundclick.com/bands/pagemusic.cfm?bandID=695366

Just click the "hi-fi" button on the last two Dan Echo files to stream them, or download the mp3s. The first clip is some oscillation, the second is some circuit bending with the pedal. That thing has some pretty wild noises in it.

-chris

[theblueark]

I've got a demo of the modded Fab Echo as well as a Fab Flange here:
http://www.youtube.com/watch?v=95Lv76ubxeM

[Uma Floresta]

I've got a demo of the modded Fab Echo as well as a Fab Flange here:
http://www.youtube.com/watch?v=95Lv76ubxeM

That's really great. What I would be interested in doing would be separating the delay from the dry signal in the Fab Echo, running the delay through a Fab Chorus in the same enclosure, and then mixing the chorused delay back in with the dry signal. Anyone have a clue how to separate the delay from the dry in the Echo?

[chris_d]

Anyone have a clue how to separate the delay from the dry in the Echo?

Let me start by saying i don't have any electronics knowledge to speak of, just some hack experience.

Though they have different chips, the Dan Echo and Fab Echo seem somewhat similar in implementation?

In the Dan Echo the mix of clean and affected signals is controlled by a pot. Perhaps in the Fab Echo this pot is replaced by a simple resistor to provide a set balance of clean and delay? Maybe that is not how this kind of circuit works though! Like i said, i don't know much.

Is there a schematic available for either pedal?

-chris

[Uma Floresta]

Anyone have a clue how to separate the delay from the dry in the Echo?

Let me start by saying i don't have any electronics knowledge to speak of, just some hack experience.

Though they have different chips, the Dan Echo and Fab Echo seem somewhat similar in implementation?

In the Dan Echo the mix of clean and affected signals is controlled by a pot. Perhaps in the Fab Echo this pot is replaced by a simple resistor to provide a set balance of clean and delay? Maybe that is not how this kind of circuit works though! Like i said, i don't know much.

Is there a schematic available for either pedal?

-chris

Well, there is a mix knob in the Fab echo, but it doesn't get 100% wet - that would be another nice thing to have. I haven't seen any schematics, though.

[chris_d]

Well, there is a mix knob in the Fab echo, but it doesn't get 100% wet - that would be another nice thing to have. I haven't seen any schematics, though.

Maybe sort of the same situation with the Dan Echo and its "repeats" knob. There is a pot that contols the repeats, but also a resistor that seems to ensure that the resistance does not go below a set point and allow oscillation.

Being a brute, i just swapped pots and resistors and jumpers until i got the result i was looking for. Sometimes that works. Surely, possession of a schematic would make the process much quicker and more effective, for a "non-hack" approach though!

-chris