Death by Audio - Evil Filter [traced]

[modman]

there is a video on youtube.. i was able to get this from the video.. its very similar but not the same as the original version..

diodes are 1n4001 or similar..

ENJOY!!

[jrfox92]

Are you talking about a demo video or the video where they show the schematic right to the camera?

Also, thank you for all these schematics, dude.

[Glass_Hero]

Link


this one..

[~arph]

So where does the filter connect to the signal?

[EBRAddict]

It looks like that active filter IC is $18 and the optocouplers are $3 each. That's an investment for a noisemaker.

[benweasel]

Are these two independets effects or has this two 3PDT or enything else ?

[~arph]

Two footswitches.. You can see the proposed artwork for the pedal at 2:31 in the video above.
Also, you can see how he solders.. and we all know the quality of soldering in DBA pedals.

[tabbycat]

Two footswitches.. You can see the proposed artwork for the pedal at 2:31 in the video above.

pic posted by jurioste at ilf...



along with a summary of what he believes the pedal is:

"The two filters in the sound saw were like that of a 'wah' and 'bass to treble' (like the tone knob of the fuzz war). The Kill Kill filter used two of the same filters that have the similar 'wah' range.

As you may or may not know, DBA recycled/recycles several circuits and each time they put out a new pedal using one of those circuits, it's slightly improved.

The filter in the Evil Filter is that of the 'Evil Filter' (go figure right?). The Evil Filter circuit was used in several pedals like the Reznor Filter, Fuzz Fuzz Filter, Sound Master, APTBS wah filter +more. As far as I know and from what I've heard playing through my own pedals, it's not the same as the filters found in the Sound Saw and Kill Kill filters.

The Evil Filter has a few options added to it like ‘Resonance’, Frequency, shape select, and output. Another addition is a ‘warp’ jack for an expression pedal…
This one never worked for me so I can’t tell you more about it but it will be included with this new production model.
One of the downsides to the new version is that there is no 6-way selector switch to change fuzz flavors.

Some of the last runs of the Evil Filter had a little switch on them for fuzz so the production ones should be derived from those Evil Filters.
If you see the guts, it’s quite interesting. The prototype, first run, and first run with fuzz, ALL had the SAME boards. The production ones just weren’t fully populated. This is another thing DBA did because they offered custom options and/or tweaked some for their personal use.

Sounds like high/lo/band pass filter with ring mod controls, and a three way tone switch, but now with fuzz."

http://ilovefuzz.com/viewtopic.php?f=14 ... 70#p943783

@ glass hero. thanks for posting the schematic. i've got a kill kill clone that i've never got running right and i think this will inspire me to see that through and maybe add a little evil as i go.

re dba schems, i saw the list you posted at ilf of the others you mentioned you have. would definitely be interested in hearing and seeing more about the 'space cave' here, since ilf have quite an 'unprogressive' policy re posting that kind of thing there. might be fun to think about while we wait to see what the ghost delay is about.

the reverberation machine schematic is the dba i'm most curious about. am deep in a belton thing atm.

[deltafred]

i was able to get this from the video.. its very similar but not the same as the original version..

The orientation of those transistors looks a bit suspect to me (unless it is a Devi Ever design of course ).

[jrfox92]

Two footswitches.. You can see the proposed artwork for the pedal at 2:31 in the video above.

pic posted by jurioste at ilf...

[ Image ]

along with a summary of what he believes the pedal is:

"The two filters in the sound saw were like that of a 'wah' and 'bass to treble' (like the tone knob of the fuzz war). The Kill Kill filter used two of the same filters that have the similar 'wah' range.

As you may or may not know, DBA recycled/recycles several circuits and each time they put out a new pedal using one of those circuits, it's slightly improved.

The filter in the Evil Filter is that of the 'Evil Filter' (go figure right?). The Evil Filter circuit was used in several pedals like the Reznor Filter, Fuzz Fuzz Filter, Sound Master, APTBS wah filter +more. As far as I know and from what I've heard playing through my own pedals, it's not the same as the filters found in the Sound Saw and Kill Kill filters.

The Evil Filter has a few options added to it like ‘Resonance’, Frequency, shape select, and output. Another addition is a ‘warp’ jack for an expression pedal…
This one never worked for me so I can’t tell you more about it but it will be included with this new production model.
One of the downsides to the new version is that there is no 6-way selector switch to change fuzz flavors.

Some of the last runs of the Evil Filter had a little switch on them for fuzz so the production ones should be derived from those Evil Filters.
If you see the guts, it’s quite interesting. The prototype, first run, and first run with fuzz, ALL had the SAME boards. The production ones just weren’t fully populated. This is another thing DBA did because they offered custom options and/or tweaked some for their personal use.

Sounds like high/lo/band pass filter with ring mod controls, and a three way tone switch, but now with fuzz."

http://ilovefuzz.com/viewtopic.php?f=14 ... 70#p943783

@ glass hero. thanks for posting the schematic. i've got a kill kill clone that i've never got running right and i think this will inspire me to see that through and maybe add a little evil as i go.

re dba schems, i saw the list you posted at ilf of the others you mentioned you have. would definitely be interested in hearing and seeing more about the 'space cave' here, since ilf have quite an 'unprogressive' policy re posting that kind of thing there. might be fun to think about while we wait to see what the ghost delay is about.

the reverberation machine schematic is the dba i'm most curious about. am deep in a belton thing atm.

Jurioste is fairly close to the truth.
The Evil Filter is, basically, a synth filter (I'm pretty sure it's a State Variable Filter).
Originally I thought the Reznor filter was just a slightly modified one, but, according to Glass Hero, it's just an Anderton Super Tone Control, which makes sense based on the (admittedly fairly limited) gut shots I've seen. I read that the APTBS filter is the same thing as the Reznor filter from this guy in France who has one of the Reznor filters and has opened for APTBS a few times.
I haven't seen anything beyond the .gif on DBA's site of the Sound Master, but the site says it's based on a Studiomaster EQ, so I assume it differs from the other filters.
Also, I've only seen three models so far (including the newest one) and, from what I've gathered, they use "ring" and "resonance" as interchangeable terms. So there's no ring mod.
I also think that the fuzz is the Harmonic Transformer, but I haven't found many details on the fuzz, so I don't know.

Another thing is that I think any attempt to clone the Ghost Delay would probably be futile unless you can do SMD stuff. I think they get the circuit boards/smd attachments done in China and then have to fix just about everything once it gets to the states.

Just what little I've managed to figure out about the filters and such so far.

[jrfox92]

So, I took a screen shot of their computer schematic which seems to have a few extra things going on so I'll try copying it up in the next day or two.

[modman]

So, I took a screen shot of their computer schematic which seems to have a few extra things going on so I'll try copying it up in the next day or two.

Okay, so, based on the other schematic I found out what the fuzz/filter switches were and how they're connected to each other.
So, the DPDT switch in Glass Hero's schematic is the Fuzz Type switch (I think it acts like the intensity switch on the Harmonic Transformer).
The 3PDT switches are connected together in a slightly hectic fashion (as far as looking at it on a schematic is concerned).
Enjoy.

[induction]

The orientation of those transistors looks a bit suspect to me (unless it is a Devi Ever design of course ).

DBA and Devi Ever have the same tendencies in that regard.

[jrfox92]

Something I just realized. Glass Hero, you should adjust your capacitor values. The four caps at the beginning of the fuzz circuit are actually labeled based on code rather than values. So, C1 is 105 and would be 1uF while C2, C3 and C4 are 104 and still .1uF/100nF.

[modman]

Okay, so I made a Vero layout.
I think it's all correct, not 100% sure, I plan to start breadboarding tomorrow but I won't have everything for it until next week.
Also, I don't have vero software, so it'd be nice if someone would actually make it presentable and understandable, too.
The edits were made with MS Paint, so please don't freak out because it looks like I did it all while drunk.

[tabbycat]

Okay, so I made a Vero layout.
I think it's all correct, not 100% sure, I plan to start breadboarding tomorrow but I won't have everything for it until next week.
Also, I don't have vero software, so it'd be nice if someone would actually make it presentable and understandable, too.
The edits were made with MS Paint, so please don't freak out because it looks like I did it all while drunk.

many thanks for the efforts, jrfox. you've definitely made this your misson to crack.

i can mess up even the neatest vero layout (it's a talent) so will wave your layout under the noses of some grand master vero ninjas i know to see if they bite. and drag it back here if any takers.

i like that drunk look, the hand of the artist. the vero layouting software most (even i) use is diylc. it's free and pretty intuitive. no long manuals to read etc. it can also speed things up re small changes in contrast with pen and pencil, as you just shuttle components around with mouseclicks instead of having to rub out and start again.
https://github.com/bancika/diy-layout-creator

i will play around with it myself re a layout but i think it's way too big for what i can manage at the moment. but maybe.

[tabbycat]

here's a cheeky shortcut to a proper layout that may serve our needs in the meantime. bit easier to read.

evilfilter 2014 sketch layout - Copy.jpg

[d312a]

Okay, so I made a Vero layout.
I think it's all correct, not 100% sure, I plan to start breadboarding tomorrow but I won't have everything for it until next week.
Also, I don't have vero software, so it'd be nice if someone would actually make it presentable and understandable, too.
The edits were made with MS Paint, so please don't freak out because it looks like I did it all while drunk.

Big thanks for your effort!
I made a vero on DIYLC based on your layout with a bit of assistance by tabbycat

http://guitar-fx-layouts.42897.x6.nabble.com/file/n24687/death_by_audio_evil_filter_fuzz_full.png;cid=1443235857899-346

[albru80]

I've managed to reduce the size a bit:

[jrfox92]

Anyone verify it? I breadboarded the fuzz circuit, but it was so gated it just farted out notes.