Death By Audio - Soundwave Breakdown  [traced]

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Frances Rhodes
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Post by Frances Rhodes »

hi!

i did some research and it seems you drew the 5089s backwards.
http://www.datasheetcatalog.org/datashe ... 037_DS.pdf
according to this datasheet, leg 1 is the emitter, and on your schematics, leg 1 appears to be the collector.
your drawing also says leg 1 of the 5306s is the base
http://www.experimentalistsanonymous.co ... 2N5306.pdf
this datasheet says 1 is the emitter and 2 is the base.

i'm very far from being an expert so i'd rather ask before i fry everything and pay a sh*t-load of shipping cost to get new parts!! :wink:

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Post by Nocentelli »

I'm not sure Glass Hero intended the numbers to reflect the pin numbers in the transistors' respective datasheets: When doing a layout or breadboarding, just make sure you follow the schematic symbol and check the pinout for the individual transistors you're using.
modman wrote: Let's hope it's not a hit, because soldering up the same pedal everyday, is a sad life. It's that same ole devilish double bind again...

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Glass_Hero
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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
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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this list is tragically outdated..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 »

pin numbers do not reflect actual pinout.. my schem capture sometimes labels them..

but the transistors are in backwards..collector to ground..

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cortezthekiller
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Post by cortezthekiller »

I have put this one together and can verify that it is correct. The darlington transistors seem to be crucial for this circuit to oscillate and filter fully. I had also used 2n5088's instead of 5089's and it worked fine.

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Post by benweasel »

I have created this vero , i have build it , but it sounds not good.
Can someone check it that the scheme is translate right?
Last edited by IvIark on 24 Oct 2012, 01:08, edited 1 time in total.
Reason: Remove layout with error http://i47.tinypic.com/w1z489.jpg

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Post by benweasel »

Solved.

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Post by IvIark »

Was it a build problem Ben, is the layout ok?

Cheers
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Post by benweasel »

In my vero is little mistake. On last trimmer is missing trace cut.
Now it looks that pedal works like it should.

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Post by IvIark »

I'll remove that layout then and could you repost a corrected one so no one builds it wrong. Thanks for the layout. :thumbsup
"If anyone is a 'genius' for putting jacks in such a pedal in the only spot where they could physically fit, then I assume I too am a genius for correctly inserting my legs into my pants this morning." - candletears7 - TGP

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sonicmojo
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Post by sonicmojo »

I just did up the Supersonic Fuzz and was going to breadboard this out since it is similar but I'm a little confused on the schem by where the 5k and 100k trimmers connect, as well as the Sine Wave pot. There seem to be some dangling connections. Can someone who has built this please elaborate on those?

Thanks!

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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 »

sonicmojo wrote:I just did up the Supersonic Fuzz and was going to breadboard this out since it is similar but I'm a little confused on the schem by where the 5k and 100k trimmers connect, as well as the Sine Wave pot. There seem to be some dangling connections. Can someone who has built this please elaborate on those?

Thanks!
theyare trimpot and left open on one side.. so they act like adjustable resistors, you could attach the open end to the wiper if you want.. the 5k trim should only be adjusted when initially biasing the unit and left alone after that..

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Post by ranjam »

I took an old, original death by audio soundwave breakdown pedal in. Very early unit. Very sloppy, high school electronics lab attempt. This pedal just can't make but one good sound at one setting on the controls. And the controls aren't volume or gain. Noooooooooo. Putting B+ on the emiter of each darlington NPN transistor. Very spitty and gated.
I traced it out, I think. For a low parts count, there is a mess to poke through, but here is my best effort.
I have tried to reduce the gain, but it is still just that one setting giving you a bombastic, over-the-top sound; spitty, gated, etc. Any other setting chokes the output worse, and extreme settings have the pedal motorboating. :shock: This can't be normal.
Anyone have real experience with this pedal? Notthe current one you see with six transistors or three knobs. The transistors are in 'backwards', so normal biasing ideas don't work. This is one weird pedal. Thanks in advance, and any help is greatly appreciated.
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Post by ranjam »

Oops! :oops:
Small error; should be more accurate now!

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Post by ranjam »

No one has one? There are YouTube videos, and it does sound as spitty and gated as I thought. I did change a couple of resistors, and added one more, to try and tame it down. I think it is modestly tamer, but still crazy. In the PGS demo, it even has the same motorboating with both controls on '0'. :shock:
I have it tamer, as I say, but I doubt I can make it usable for old farts like myself. This is definitely a 'noise' pedal for the younger kids. :P
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Post by Zokk »

Yup that's a nice "in your face" squarewave generator :lol:

In the PGS demo they've shown the two trimpots, one for the "input threshold" and the second for the "level" (I assume it's the output level).
Do you have the values for these trimmers please?

edit: or maybe the trimpots are on your schematic, but then the two pots are missing...

Cheers.

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Post by ranjam »

No, the schematic I drew is what I have. No printed circuit board, no trim pots. Just a lot of hand wiring to a small perf board floating in mid-air, and 'serial number' of '4'. I thought a lot of the extra wire could make it act weird (capacitance, inductance, etc.), but no such luck. For so few parts, it sure makes a lot of weird noises.
I think I am done with it. With a Strat it is even worse. It seems to need a hot input. With a Les Paul and hot humbuckers it still gates at the end of a note (not much for sustain), and spits as the notes chokes out abruptly. But If sustain isn't a prerequisite for you, just low note riffing sounds like a snarly fuzz. That I could use, but no screaming bent notes on the high 'E' string. There's just not a lot of sustain. You'd never mistake this for a Muff. Maybe a horribly biased Fuzz Face.
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Post by bc108 »

I'm dealing with this... 'thing'?

No succes at all.

Both transistors BCE (collectors to ground).
I used KSP13 (MPSA13), and MPSA29 (Hfe around 10.000).

Nothing happen: sounds really HORRIBLE
When Bias is fully closed (no k's at all), the Collector of Q2 eat a LOT!.

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Post by toneman »

IIRC, NPN transistors have positive on collector.
(the "arrow" points AWAY from the base)
the schematic has this reversed.

Learning About Electronics:
http://www.learningaboutelectronics.com ... transistor

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Post by jrfox92 »

What? [smilie=a_huh.gif]

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Post by Nocentelli »

toneman wrote:IIRC, NPN transistors have positive on collector.
(the "arrow" points AWAY from the base)
the schematic has this reversed.

Learning About Electronics:
http://www.learningaboutelectronics.com ... transistor

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toneman, meet death by audio; death by audio, meet toneman.
modman wrote: Let's hope it's not a hit, because soldering up the same pedal everyday, is a sad life. It's that same ole devilish double bind again...

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