Re: Death by Audio - Kill Kill Filter  [traced]

General documentation, gut shot, schematic links, ongoing circuit tracing, deep thoughts ... all about boutique stompboxes.
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~arph
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Post by ~arph »

I see the same monkey is still doing the pcb design and soldering
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FiveseveN
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Post by FiveseveN »

selfdestroyer wrote:unnecessary tiny traces for the win!
I don't think they know how to change trace width in whichever CAD software they use (probably PADS for DOS).
Seriously, who the fuck would do this instead of the red route?!
Image

Anyway, here's an overlay and straightened/aligned images:
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ffbottom.jpg
fftop.jpg
ffoverlay.jpg
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Glass_Hero
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my favorite amplifier: My Glass Hero Amplification
Completed builds: 1973 Orange Graphic 120 head
Fender Champ clone head
custom Pentode input single channel 20 watt head
custom "plexi" 5 watt single ended head
custom Pentode input single channel ~2 watt combo (smaller version of my 20watt)
( i build amps and pedals )

pedal clones
Pro Co Rat
Univox SuperFuzz
Sonic Edge J&J Overdrive
Interfax Harmonic Percolator
EHX Electric Mistress
EHX Big Muff PI
EHX Big Muff into a DBA Fuzz War
Green Ringer
Orange Squeeze
Boss Slow Gear
Death By Audio Sound SAW
Death By Audio Armageddon
Death By Audio Fuzz War
MXR Phase 90
EA Tremolo
TS 808
another TS808 modded out for bass
various loop, boost, kill, stutter, feedback and signal pad stompboxes

pedal modds
big muff clipping modds and internal feedback loops w/ LDRs
EHX POG exp pedal modd
VOX 847 wah modds (expression pedals should be expressive)
Cry Baby Modds
BOSS XT-2 modds


this list is tragically outdated..
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Post by Glass_Hero »

i traced his a while back.. Enjoy..

This is not an updated sound saw..
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kill_kill_filter.bmp
kill_kill_filter.bmp (96.31 KiB) Viewed 2355 times

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Bernardduur
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Post by Bernardduur »

Wow, looks a lot like a muff :)
'No more....... loud music.......'
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Nocentelli
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Post by Nocentelli »

...but no clipping diodes. So it's BMP Q1 ->BMP sustain control -> another BMP Q1 -> two odd switchable quasi-BMP tone stacks->BMP Q4.

:scratch: I can't visualise what the tonestacks would do as drawn: The normal lug 3 to ground resistor is missing, and instead the wiper is tied to lug 1 (i.e. 82n to ground) via that second 220k resistor. If the 220k went from lug 3 to ground, it would give an extremely scoopy, but fairly narrow sweep -
kill kill filtersweep.png
vanessa wrote: 20 Aug 2007, 17:51 You can't arrest someone for reverse engineering something.

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Bernardduur
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Post by Bernardduur »

The 220k is a feedback path......

The tone control should more work like a filter on one side of the potmeter and a pass through on the other.
'No more....... loud music.......'
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Glass_Hero
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Posts: 114
Joined: 31 Jan 2011, 03:02
my favorite amplifier: My Glass Hero Amplification
Completed builds: 1973 Orange Graphic 120 head
Fender Champ clone head
custom Pentode input single channel 20 watt head
custom "plexi" 5 watt single ended head
custom Pentode input single channel ~2 watt combo (smaller version of my 20watt)
( i build amps and pedals )

pedal clones
Pro Co Rat
Univox SuperFuzz
Sonic Edge J&J Overdrive
Interfax Harmonic Percolator
EHX Electric Mistress
EHX Big Muff PI
EHX Big Muff into a DBA Fuzz War
Green Ringer
Orange Squeeze
Boss Slow Gear
Death By Audio Sound SAW
Death By Audio Armageddon
Death By Audio Fuzz War
MXR Phase 90
EA Tremolo
TS 808
another TS808 modded out for bass
various loop, boost, kill, stutter, feedback and signal pad stompboxes

pedal modds
big muff clipping modds and internal feedback loops w/ LDRs
EHX POG exp pedal modd
VOX 847 wah modds (expression pedals should be expressive)
Cry Baby Modds
BOSS XT-2 modds


this list is tragically outdated..
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Post by Glass_Hero »

the filter is based off a twin T filter, with only one adjustable leg.. A twin T should give a notch response, however in this configuration it produces a tilt response..

This pedal is based off the current production dba fuzz war (big muff), the third stage is omitted (the one with the clipping diodes) and some values have been tweaked..

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Post by mmolteratx »

Uggh. Every time I see guts of their pedals, I just can't help but wonder what fuckwad thinks that's even remotely acceptable, especially for the prices they charge.

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Bernardduur
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Post by Bernardduur »

Glass_Hero wrote:the filter is based off a twin T filter, with only one adjustable leg.. A twin T should give a notch response, however in this configuration it produces a tilt response..

This pedal is based off the current production dba fuzz war (big muff), the third stage is omitted (the one with the clipping diodes) and some values have been tweaked..
Ah yes, now I see the twin T filter. Wouldn't it be easier to put the potmeter between the cap and ground :)
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Post by BetterOffShred »

Necrobump..

Anyone build one of these? I built one using the main page layout from Tagboard which from what I can tell matches the above schematic.

These DBA layouts only work sometimes, I tried a few different transistors but it gates pretty bad and doesn't seem like any of the videos. I was curious if anyone who built one had suggestions on which components they swapped to get it to work haha

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