Search found 62 matches

by Cannibal
04 Mar 2018, 12:00
Forum: Boutique Stompboxes dissected...
Topic: Blackout Effectors - Crystal Dagger
Replies: 2
Views: 1168

Re: Blackout Effectors Crystal Dagger layout/schematic/guts?

Very interested in this!

Maybe it's some kind of Superfuzz unit (left) with a section of their Whetstone phaser (right) ?
by Cannibal
10 Mar 2017, 21:46
Forum: Boutique Stompboxes dissected...
Topic: Death by Audio - Apocalypse [traced]
Replies: 41
Views: 20870

Re: Death by Audio - Apocalypse [traced]

Maybe a dumb question, but why does this schematic use a 2x6 rotary and not a 2x5? Hey there! My supplier sells 2x6 only. But on rotaries like these there is a metal ring with a tip. By adjusting the tip in the correct hole, you simply stops the rotations. So the standard has 6 positions, but you c...
by Cannibal
02 Mar 2017, 16:53
Forum: Boutique Stompboxes dissected...
Topic: Death by Audio - Apocalypse [traced]
Replies: 41
Views: 20870

Re: Death by Audio - Apocalypse [traced]

well, i've checked everything and tried a zillion different transistors for the MPSA06 'scoop' circuit (i socketed that transistor) and it still has about a 10% or less of the volume than the other 4 settings. if i could just get it to be the same as the others, i'd probably be happy with it. Weird...
by Cannibal
26 Feb 2017, 15:08
Forum: Boutique Stompboxes dissected...
Topic: Death by Audio - Apocalypse [traced]
Replies: 41
Views: 20870

Re: Death by Audio - Apocalypse [traced]

Hey Johnk, thanks for your feedbacks!! Mine has the tone control like made in the layout (the 2nd one you're referring about). As I told in a previous post, one can try different pin wirings on the tone control depending on what is needed. In the last layout acts mostly like it's supposed to do, but...
by Cannibal
24 Feb 2017, 09:35
Forum: Boutique Stompboxes dissected...
Topic: Death by Audio - Apocalypse [traced]
Replies: 41
Views: 20870

Re: Death by Audio - Apocalypse [traced]

Johnk, I didn't experience any of the low output issues. Are you sure you did the very same of the schem? The only way you can have low output is by forgetting one of the input capacitors on the circuits (the 100 nf for example where the signal enters in the squarewave section of the circuitry) or o...
by Cannibal
16 Feb 2017, 14:17
Forum: Boutique Stompboxes dissected...
Topic: Death by Audio - Apocalypse [traced]
Replies: 41
Views: 20870

Re: Death by Audio - Apocalypse [traced]

My bad!! There was a mistake and the pedal seemed to work properly due to the ultra-heavy amount of gain. I corrected a couple issues and now it works. Treat the SCOOP transistor (NPN MPSA06) like a PNP - that means collector to GND. Squarewave section TL072 has pin 3 and 5 connected to Vref. Check ...
by Cannibal
10 Feb 2017, 16:10
Forum: Boutique Stompboxes dissected...
Topic: Death by Audio - Apocalypse [traced]
Replies: 41
Views: 20870

Re: Death by Audio - Apocalypse [traced]

Done and tested, I'd say verified.
That's my take on the DBA Apocalypse, reversed from an original a friend owns.

Hope it helps.
Enjoy.

Updated files are here
by Cannibal
12 Apr 2015, 11:33
Forum: Pimp-My-Cheap-Pedal
Topic: Best Mods for a Black Russian Big Muff?
Replies: 28
Views: 22226

Re: Best Mods for a Black Russian Big Muff?

This is a BMP with Whizzer Mods: https://www.youtube.com/watch?v=v8jXlTuUvQs After 10 minutes of playing, I decided to restore it to the standard Black Russian BMP...now I'm happy :) Have you traced the mods? I am curious on what could make a big muff sound in such a strange way... No clipping diod...
by Cannibal
22 Nov 2014, 14:20
Forum: Boutique Stompboxes dissected...
Topic: Wyllie Moonrock [traced]
Replies: 25
Views: 11285

Re: Wyllie Moonrock [traced]

Can someone explain me what is the purpose of D4 at the collector of the second transistor? I can't really think of anything except for dropping the voltage by 0,7v
by Cannibal
15 Jun 2014, 18:51
Forum: Boutique Stompboxes dissected...
Topic: Dumbloid [traced]
Replies: 471
Views: 125669

Re: Dumbloid [traced]

Correct me if I'm wrong but wouldn't lowering the value of those resistors give Q1 and Q2 a much hotter bias? Do you suppose the designer is using them as boosts or to contribute to the distortion in some way? I've read in a couple of earlier posts that these changes seemed "arbitrary" bu...
by Cannibal
25 May 2014, 18:01
Forum: Pimp-My-Cheap-Pedal
Topic: single to dual supply
Replies: 4
Views: 2337

Re: single to dual supply

c3, c7 the diodes and r5 all goes to ground.
by Cannibal
09 Mar 2014, 16:22
Forum: Boutique Stompboxes dissected...
Topic: Dumbloid [traced]
Replies: 471
Views: 125669

Re: Dumbloid [traced]

TLC2262 to my ears clips more gracefully than most of the other opamps. Dunno it's because it's a MOS opamp or because of it's abysmal slew rate (0.35 to 0.55 Volt per millisecond, according to the datasheet).
by Cannibal
06 Mar 2014, 20:56
Forum: Boutique Stompboxes dissected...
Topic: Dumbloid [traced]
Replies: 471
Views: 125669

Re: Dumbloid [traced]

The biasing resistor of the first buffer is only 150k, this thing has a pretty low input impedence. Do you think that's a deliberate choice or just a mistake by the "designer"?
by Cannibal
10 Feb 2014, 11:41
Forum: Boutique Stompboxes dissected...
Topic: Secretefx - Secret-1 STD overdrive [traced]
Replies: 31
Views: 12112

Re: Secretefx - Secret-1 STD overdrive [traced]

Aside from the buffers, is R5 just a positive feedback resistor? Also the frist opamp max gain is around 500x, so this thing should have a massive amount of distortion going on, instead is just a medium gain overdrive. Am i missing something?
by Cannibal
13 Nov 2013, 11:51
Forum: DIY Stompbox designs
Topic: Muff driver - Big Muff Pi modified for a smoother taste
Replies: 18
Views: 8631

Re: Muff driver - Big Muff Pi modified for a smoother taste

Now this sounds interesting. When you talk about negative feedback, do you mean the base-collector cap and resistor pairs? I'm just heading home now to try out a couple of ideas on this circuit. First is a dual-gang pot acting as a pair of emitter resistor AC bypass pots on the two clipping stages ...
by Cannibal
11 Nov 2013, 13:14
Forum: DIY Stompbox designs
Topic: Muff driver - Big Muff Pi modified for a smoother taste
Replies: 18
Views: 8631

Re: Muff driver - Big Muff Pi modified for a smoother taste

Hey Nocentelli, have you tried using some negative feedback to tame the beast? bet you can get some low gain smooth tone if you filter some high end and super low end in the feedback network.
by Cannibal
28 Sep 2013, 17:00
Forum: DIY Stompbox designs
Topic: Quartz Overdrive... Perhaps the end of tubes?
Replies: 19
Views: 7743

Re: Quartz Overdrive... Perhaps the end of tubes?

Low input impedance is probably the key for a good sound here. Can somebody try a buffer in front of it? I predict that there would me much more treble coming out of this little circuit.
by Cannibal
22 Aug 2013, 20:55
Forum: Ready-To-Build Effect Projects
Topic: "Little Angel" - Super Simple PT2399 Mini Chorus
Replies: 357
Views: 32577

Re: "Little Angel" - Super Simple PT2399 Mini Chorus

my first guess is that you've put a wrong value resistor in the mixing stage (the two 10k resistors before the output).
by Cannibal
24 Oct 2012, 11:58
Forum: Boutique Stompboxes dissected...
Topic: GasPedals - Dumbbell
Replies: 63
Views: 16804

Re: GasPedals - Dumbbell

Greg wrote:Why would he socket those resistors ??
:scratch:
Probably he just messed up, the socket was for the IC but he put it in the wrong place. :D
I'm gonna try to trace a schematic for this, it shouldn't be that hard.
by Cannibal
06 Aug 2012, 11:19
Forum: DIY Stompbox designs
Topic: "The Fixation" Distortion / Fuzz.
Replies: 8
Views: 3241

Re: "The Fixation" Distortion / Fuzz.

Thank you juanro for this project. Have you already tried this pedal after a buffered one? I'm not sure on this, but the input impedance seems quite low and that could affect the fixation performances in a pedal chain.