Circuit Analysis

The research folders: please contribute whatever little piece of information you might have on stompbox circuits new or old. Discussion should be civil and to the point.

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Vintage Stompbox Corner ( ... - 1975)
Discussion regarding early stompbox technology: 1960-1975 Please keep discussion focused and contribute what info you have...
Topics: 671

671 Topics

15209 Posts

Last post Germanium in my attic
RuptorGB
today, 11:54
Modern Stompbox Effects (1975 - ...)
All about modern commercial stompbox circuits from Electro Harmonix over MXR, Boss and Ibanez into the nineties.
Topics: 1695

1695 Topics

24795 Posts

Last post Re: so, i broke a new dod ped…
astrobass
yesterday, 19:12
Boutique Stompboxes dissected...
General documentation, gut shot, schematic links, ongoing circuit tracing, deep thoughts ... all about boutique stompboxes.
Topics: 1874

1874 Topics

58725 Posts

Last post Re: Catalinbread - Galileo Mk2
micmac
today, 12:57
DIY Projects
Original effects with schematics, layouts and instructions, freely contributed by members or found in publications. Cannot be used for commercial purposes without the consent of the owners of the copyright.
Subforums: Printed/Published Online Designs, Original Tracer Layouts
Topics: 1610

1610 Topics

28775 Posts

Last post Coordinating rehearsals and g…
Aris
yesterday, 16:06
Electric Guitar/Bass Wiring
Pickups, wiring schemes, switch techniques and onboard active electronics for guitars and basses
Topics: 290

290 Topics

2640 Posts

Last post Re: Fishman Universal Recharg…
Voffkins
today, 05:48
Analysis Requests Folder
Before you launch a request, please a) search the forum; b) search the web and c) share whatever you did find and where you searched.
Topics: 875

875 Topics

3918 Posts

Last post TheGunn
29 aug 2024, 13:26

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Last post

Original tracer layouts for classic pedals

Last post by andregarcia57 « 30 May 2023, 14:03
Replies: 61
by peps1 » 26 Apr 2010, 18:16
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Rating: 2.2%

(Hope this is in the right place, as it n0ot really a technical question and didn't want to post a request in the vintage section)

Hi Guys,

Trying to gather a collection of Original tracer layouts for classic pedals like the Tycobrahe Octavia, Dallas Rangemaster, ToneBender, Muffs & so on.

Got a couple so far....but would love more!
61 Replies

69259 Views

View the latest post Re: Original tracer layouts …
Last post andregarcia57
30 May 2023, 14:03
BOSS Book (pdf & mp3's)

Last post by The G « 15 Dec 2020, 15:28
Replies: 3
by The G » 15 Dec 2020, 15:02

Rating: 4.1%

Discussion is here

--------
Did a compressed version. Didn't noticed visual differences compared to the original.

The Boss Book.pdf

And the audio files:

01-AudioTrack 01.mp3
02-AudioTrack 02.mp3
03-AudioTrack 03.mp3
04-AudioTrack 04.mp3
05-AudioTrack 05.mp3
06-AudioTrack 06.mp3
07-AudioTrack 07.mp3
08-AudioTrack 08.mp3
09-AudioTrack 09.mp3
10-AudioTrack 10.mp3
11-AudioTrack 11.mp3
12-AudioTrack 12.mp3
13-AudioTrack 13.mp3
14-AudioTrack 14.mp3
15-AudioTrack...

3 Replies

22853 Views

View the latest post Re: The BOSS Book
Last post The G
15 Dec 2020, 15:28
Tim Escobedo's "Folkurban" circuits. Zipped.

Last post by modman « 26 Jan 2020, 03:10
Replies: 24
by culturejam » 17 Mar 2012, 15:41
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Rating: 11.2%

I've recently noticed that Tim's great site at is coming up as a virus, trojan horse, or other bad things in my browser. So I thought I'd grab all the circuit images and zip them up for safe keeping. I have emailed him in the recent past, but there has been no reply. :hmmm:

Attached is a zip file of ALL of the effects circuits from his site.

Rock on, and may the creative spirit of the Great Escobedo be with you always. :thumbsup
24 Replies

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View the latest post Re: Tim Escobedo's "Fol …
Last post modman
26 Jan 2020, 03:10
THE ENGINEER'S THUMB... At last, a better compressor!

Last post by jhergonz « 20 May 2018, 18:09
Replies: 101
by merlinb » 21 Apr 2012, 14:23
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Rating: 14.3%

For a long time I've felt guilty that my pedal board didn't include a compressor. Finally, after about a year of breadboarding, I have produced a circuit that can take on a Dynacomp and win , boasting:

Up to five times more headroom than a Dynacomp
Less noise than a Dynacomp
Same available sustain as a Dynacomp
Fewer parts than a Dynacomp
Cheaper than a Dynacomp
Feedforward side chain
Possibility for all five controls
Fits in 1590B
Millennium bypass

Despite its final simplicity, I went though...
101 Replies

216646 Views

View the latest post Re: THE ENGINEER'S THUMB... …
Last post jhergonz
20 May 2018, 18:09
READ THIS before posting!!

Last post by modman « 11 Sep 2011, 13:52

by modman » 11 Sep 2011, 13:52

Rating: 1.7%

This section is devoted to circuit analysis . This means...

requests for schematics or layouts will be moved the the Request section
messages about your sick puppy or your new Android powered phone should go into the FSB Café
debugging questions will be moved to the Workbench
useless post (containing no extra information) may get deleted to preserve the readability of the thread.
you should check whether a thread exists about the unit in question, and add your info in that thread.
you...

0 Replies

55074 Views

View the latest post READ THIS before posting!!
Last post modman
11 Sep 2011, 13:52
DO NOT post requests in this forum. Pretty please.

Last post by modman « 19 Mar 2010, 09:41
Replies: 2
by culturejam » 22 Nov 2009, 21:18

Pretty please, with sugar on top.

Don't post in this forum asking is there is a schematic or layout or info on XXX pedal.

There is a subforum setup for requests already. It is located here:
REQUESTS FORUM

Any requests posted here will be moved to proper sub forum, and I'll also make nasty remarks about your mother. :mrgreen:

2 Replies

54908 Views

View the latest post Re: DO NOT post requests in …
Last post modman
19 Mar 2010, 09:41
DO NOT post requests in this forum. Pretty please.

Last post by lolbou « 22 Nov 2009, 21:23
Replies: 1
by culturejam » 22 Nov 2009, 21:18

Pretty please, with sugar on top.

Don't post in this forum asking is there is a schematic or layout or info on XXX pedal.

There is a subforum setup for requests already. It is located here:
REQUESTS FORUM

Any requests posted here will be moved to proper sub forum, and I'll also make nasty remarks about your mother. :mrgreen:

1 Replies

55550 Views

View the latest post Re: DO NOT post requests in …
Last post lolbou
22 Nov 2009, 21:23
The Goose, the Middleman, the Idolmaker and Gomer Pyle

Last post by noelgrassy « 01 Feb 2008, 19:42
Replies: 91
by CS Jones » 07 Dec 2007, 21:41
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Clay, I would really love to hear the full story on this one. It seems like you have lots to tell!

Thanks LPD. How much do you want to hear? The Reader's Digest version or the pull up a chair, get comfortable because it'll be a while version ?

I'll try to finish something up this weekend. Long and short versions, if you're still interested. :)
91 Replies

248076 Views

View the latest post
Last post noelgrassy
01 Feb 2008, 19:42
Catalinbread - Galileo Mk2

Last post by micmac « Today, 12:57
Replies: 34
by juansolo » 23 May 2015, 22:19
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Rating: 8.2%

1590B stripped down Galileo Mk2.

Curly Prof in a box.
34 Replies

27108 Views

View the latest post Re: Catalinbread - Galileo M …
Last post micmac
Today, 12:57
Germanium in my attic

Last post by RuptorGB « Today, 11:54

by RuptorGB » Today, 11:54

I have Germanium transistors knocking about as in the picture and some AC128 that I can't find at present. :roll: In my hand there 10 red dot, just the 2 white dot and a roll of OA47 diodes maybe 500 or more. Are these transistors NKT275 as they were bought here in GB back in the early 1970s? This site goes on & on about Fuzz Face diodes and about 10 page downs they mention red and white dots on canned transistors.

I might have more somewhere as I have a lot of older components like...

0 Replies

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View the latest post Germanium in my attic
Last post RuptorGB
Today, 11:54
Fishman Universal Rechargeable Battery Pack

Last post by Voffkins « Today, 05:48
Replies: 6
by ABtheBassPlayer » 12 Aug 2023, 18:46

Rating: 0.6%

Greetings! Been looking for pictures of this thing with no luck. Was wondering if anyone would mind taking pictures of one of these? Thank you!

6 Replies

2562 Views

View the latest post Re: Fishman Universal Rechar …
Last post Voffkins
Today, 05:48
Why does the Euphoria behave better when stacked into than others?

Last post by m4268588 « Today, 04:47
Replies: 9
by aquataur » 06 Aug 2024, 17:17

Rating: 1.9%

Everybody knows that a TS sounds horrible into a Fender, while it sounds great into a Marshall.
Also, everybody knows that a (tube) amp on the often quoted onset of clipping masks a lot of the harsh tones produced by dirt boxes.

Stacking distortion pedals can mimic that. I cannot remember the reason (probably one of Wampler's blogs) for getting the Euphoria,
but this really excels at this job - mimic-ing the amp break-up. I like to use the center setting - all diodes off.

The interesting...

9 Replies

999 Views

View the latest post Re: Why does the Euphoria be …
Last post m4268588
Today, 04:47
DOD - FX69b Grunge - modifications

Last post by astrobass « Yesterday, 19:12
Replies: 83
by pinkjimiphoton » 05 Aug 2011, 02:28
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hi guys,

was out earlier buying parts (what else) and stopped at a pawn shop, lookin' around...found a really cool old silvertone lapsteel, almost jumped on it...150 bux i didn't have.

anyways, as always, i asked if they had effects...

and they had one...a dod fx69b grunge.

don't close the window yet, tho. ;) it gets better.

i ask 'em what they want for it, they say what will ya give me?

so i, of course, being ever cheap, say 5 bucks.

he says eight. i say sold. i mean, for 8 bucks, ANY...
83 Replies

74205 Views

View the latest post Re: so, i broke a new dod pe …
Last post astrobass
Yesterday, 19:12
Heavy Electronics - Grind Fuzz

Last post by astrobass « Yesterday, 19:01
Replies: 1
by astrobass » Yesterday, 18:59

Rating: 0.2%

Had one of these show up for repair with intermittent signal issues, initially saw a cheapo looking 22uf that I desoldered to replace, then while moving the board around to get photos, found the actual issue: poor soldering on one of the pot lugs allowed a lead to come loose and finally pop out entirely when presented with a small amount of direct physical interaction.

Transistors are 2N3906, blue caps are 47n, 22n, big red cap is 100n. Didn’t bother removing the knobs to get a look at the pot...

1 Replies

90 Views

View the latest post Re: Heavy Electronics - Grin …
Last post astrobass
Yesterday, 19:01
Coordinating rehearsals and gigs is never easy!

Last post by Aris « Yesterday, 16:06

by Aris » Yesterday, 16:06

Hi,
Between those who always forget rehearsal dates or those who crash a gig because of a poorly designed calendar, frankly, organizing all that is always a pain. I recently found a nice solution that allows you to synchronize several calendars without any hassle, it's on syncthemcalendars. Practical for coordinating rehearsals, booking concert dates, or even just managing everyone's availability when you have several projects at the same time. No need to run after everyone to reschedule...

0 Replies

52 Views

View the latest post Coordinating rehearsals and …
Last post Aris
Yesterday, 16:06
Silent Switching 40106 4066

Last post by twotees « Yesterday, 14:11
Replies: 10
by J4mes » 02 Aug 2024, 12:56

Rating: 1.1%

Hey, peeps.

I know this isn't the hottest topic for switching, but I haven't seen too much info, or even a schematic for this, so I decided to draw one along with a smaller board. The original board was found here, so would be useful to have it as a complete project file rather than segments posted over the internet.

I appreciate the schematic will probably need some attention to clarify pins etc.

(original board layout by andregarcia)

J

10 Replies

1308 Views

View the latest post Re: Silent Switching 40106 4 …
Last post twotees
Yesterday, 14:11
Zvex - Fuzz Probe

Last post by Bernardduur « Yesterday, 07:49

by Bernardduur » Yesterday, 07:49

Rating: 0.9%

Hi all!

I searched for it but no dedicated post was made on this effect pedal. There is one on the 'Probe series' but all probe pedals are discussed there.

I got one in for some TLC and to add a LED. The owner makes a lot of nice noise music but in the wash of his playing he couldn't hear if the pedal was on or off. I added an LED to the pedal (and a DC jack / he just cut a hole in the side to get a wire in)

You can find pics and a schematic in my blog; check the link in my sig.

I traced...

0 Replies

113 Views

View the latest post Zvex - Fuzz Probe
Last post Bernardduur
Yesterday, 07:49
Bass Tube Screamer_TS9B_Layout & Device Values

Last post by Lani « 05 Sep 2024, 17:19
Replies: 8
by Yun_Suki » 01 Sep 2024, 03:16

Rating: 3.9%

TS9B Reverse engineering,Some one help?
All is ready...Waiting for east wind🧐
TOP.jpg
TOP(refer).jpg
Down (invert).jpg
Blend.jpg
Device Values_TS9-B_Datasheet_01.png

8 Replies

668 Views

View the latest post Re: Bass Tube Screamer_TS9B_ …
Last post Lani
05 Sep 2024, 17:19
Nocturne Brain Seltzer Classic

Last post by andregarcia57 « 05 Sep 2024, 12:27
Replies: 127
by G5120fx » 18 Mar 2011, 09:03
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Rating: 11%

Hello good people!

I borrowed a Nocturne Brain Seltzer from a friend a while ago, and took a look at the guts, but don´t tell him. :blackeye
No magical snake oil inside :mrgreen: Altough a pretty nice sounding pedal!
I tried to find out some values, maybe you wanna help me to make a vero layout?
127 Replies

58820 Views

View the latest post Re: Nocturne Brain Seltzer C …
Last post andregarcia57
05 Sep 2024, 12:27
Baja Presence and Resonance 091118

Last post by J4mes « 05 Sep 2024, 10:06
Replies: 52
by bajaman » 09 Nov 2018, 08:23
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Rating: 14.7%

Here is a little circuit I just designed to emulate the presence and resonance controls in a typical tube amplifier driving a speaker cabinet.
A typical tube amplifier reacts with the loudspeaker load quite differently to a solid state amplifier - it puts extra power into the speaker at resonance and due to rising voice coil inductance at higher frequencies it puts out a progressively louder response as the frequency rises, solid state amplifiers do not do this and consequently lack the bottom...
52 Replies

69986 Views

View the latest post Re: Baja Presence and Resona …
Last post J4mes
05 Sep 2024, 10:06
Marshall - Bluesbreaker Vintage Reissue

Last post by george giblet « 04 Sep 2024, 21:11
Replies: 2
by modman » 01 Sep 2024, 16:23

Rating: 1.3%

with a thousand clones on the market, I think this really is the way to go... staying true to your own original

2 Replies

411 Views

View the latest post Re: Marshall - Bluesbreaker …
Last post george giblet
04 Sep 2024, 21:11
DemonFx Mag Echo guts…

Last post by dmc777 « 04 Sep 2024, 15:23
Replies: 2
by dmc777 » 20 Mar 2023, 03:49

Figured I’d take a few pics of this before I let it to. Not a bad sounding unit at all. Darker than most pt2399s based delays I’ve used but it has a darker vintage analog delay tone “think dod FX90 or any old Reticon units pushed to their max. Modulation was also nice. Just have too many delays. Only changed I noticed with the chips is a tl072 used instead of a burr brown. Even has voltage regulator and preamp trim.

2 Replies

903 Views

View the latest post Re: DemonFx Mag Echo guts…
Last post dmc777
04 Sep 2024, 15:23
Why is my switch popping?

Last post by Manfred « 04 Sep 2024, 13:06
Replies: 6
by Homespun » 01 Sep 2024, 03:38

Rating: 0.2%

I'm not sure what I'm doing wrong with this switching board. How can I silence the popping?
bypass.png
It's a board that powers the pedal, switches the LED and switches the effect circuit. When it is off the in tip shorts to the out tip and the effect input is grounded.

I've got a 1M Input impedance/bleed resistor on the input after the IO/IN at the beginning of the circuit. I'm thinking that I should go buffered bypass anyway but in the meanwhile I'd like to figure what is causing this...

6 Replies

335 Views

View the latest post Re: Why is my switch popping
Last post Manfred
04 Sep 2024, 13:06
Prescription Electronics - COB ( Clean Octave Blend )

Last post by andregarcia57 « 03 Sep 2024, 14:52
Replies: 40
by analogguru » 17 Jul 2007, 20:00
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Rating: 0.9%

pf fan found this pictures of the COB:

analogguru
40 Replies

25932 Views

View the latest post Re: Prescription Electronics …
Last post andregarcia57
03 Sep 2024, 14:52
Death By Audio - Interstellar Overdriver [gut shots]

Last post by Lani « 02 Sep 2024, 17:49
Replies: 62
by HEAD » 29 Jan 2010, 18:11
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Rating: 5.6%

Hi,

today I got the chance to crack on up. Better build quality than the first DBA stuff but still... hmmmm kindly spoken in great need of improvement (as my english :D). The routing of this thing sucks (why double sided? it probably would fit on a smaller pcb one sided!!!) as it does for me soundwise too. Nearly no usable sounds on a sensible volume setting. Despite that it sounds pretty farty imho - and don't get me wrong! - I realy dig some of the Devi Ever stuff soundwise, but this gadget...
62 Replies

19715 Views

View the latest post Re: Death By Audio - Interst …
Last post Lani
02 Sep 2024, 17:49

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