Emma - DB-1 DB-2 DiscumBOBulator

General documentation, gut shot, schematic links, ongoing circuit tracing, deep thoughts ... all about boutique stompboxes.

Re: Emma Electronic Discombobulator

Postby Mbas974 » 12 May 2013, 20:26

Wow, looks not really hard to build... :-)

but, what are the boxes called "1" (INV_XX).
I image it's a sort of logic port.

Any idea what could be the chip involved ?
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Emma Discumbobulator V2

Postby roseblood11 » 17 Nov 2017, 23:11

I just realized that there is a second version of this pedal, and I hope we'll get this traced.
The first version was based on the MXR envelope filter, with some mods, maybe with additional buffer(s). Clones of the MXR that had the mods described on tonepad sounded more or less identical.
https://m.youtube.com/watch?v=40cPxO1AzWQ
http://www.emmaelectronic.com/discumbobulator/
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Re: Emma - DB-1 ( DiscumBOBulator )

Postby modman » 18 Nov 2017, 18:16

I merged all Emma - DiscumBOBulator post into one thread because all the schematics have dissapeared as well as all gutshots.
Please use the attachment function to preserve shit for posterity! thanks
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Re: Emma - DB-1 ( DiscumBOBulator )

Postby POTL » 18 Nov 2017, 21:47

Image

not verified!

Image

Image
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modman (17 Sep 2019, 20:19)
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Re: Emma - DB-1 ( DiscumBOBulator )

Postby rs » 26 Apr 2018, 20:17

Here are some guts i've found a while ago.
I'm still trying to figure this one out.

Cheers.
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Re: Emma - DB-1 ( DiscumBOBulator )

Postby chicago_mike » 13 May 2018, 23:35

For the input and output caps in the Emma, I just used .022 Panasonics. sounds fine!
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Re: Emma - DB-1 ( DiscumBOBulator )

Postby rs » 15 May 2018, 08:20

Hi Mike, wich schematic did you use? Im getting strange noises. Have to check it latter. Thanks.
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Re: Emma - DB-1 ( DiscumBOBulator )

Postby roseblood11 » 23 Sep 2018, 02:07

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Re: Emma - DB-1 ( DiscumBOBulator )

Postby roseblood11 » 14 Sep 2019, 01:54

Just ordered version 2. I will post photos and schematic next week

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Re: Emma - DB-1 ( DiscumBOBulator )

Postby roseblood11 » 17 Sep 2019, 17:39

Version 2 is all smd.
As my wife is in hospital, I won't have time to do the tracing myself but I will take some macro shots.
The pedal doesn't sound better than the old version, but it might have more headroom, as it can be used with bass or power humbuckers without any distortion.
The clean boost is a useful addition, but there should be an option to change its position in the signal path: Often, it would be more useful, if the boost was directly behind the output of the wah circuit, so that the wah's bypass switch would switch both effects at the same time.
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Re: Emma - DB-1 ( DiscumBOBulator )

Postby roseblood11 » 29 Sep 2019, 17:46

Hi Res pictures...
https://www.dropbox.com/s/7nuueym110d86v2/emma.zip?dl=0

Unfortunately, I won't have time to draw the schematic. Maybe someone else will do that?

What more is needed?
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Re: Emma - DB-1 ( DiscumBOBulator )

Postby roseblood11 » 29 Sep 2019, 21:23

This is a bigger version of Bernard D'Uurs scheamtic of the old version DB-1.

Maybe it's helpful...


Any ideas on how to get the values of those smd capacitors? They aren't labeled...
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Re: Emma - DB-1 DB-2 DiscumBOBulator

Postby roseblood11 » 02 Oct 2019, 14:12

I had to return the pedal today.
But the pictures should be all that is needed to draw a schematic.

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