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Last post

The HE Bassman, in: Hobby Electronics, December 1983 🇬🇧

Last post by Manfred « 54 minutes ago
Posted in Davidoff Library
Replies: 2
by modman » 26 May 2022, 17:12 » in Davidoff Library

PDF: Hobby-Electronics-1983-12-S-OCR Bassman.pdf

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Hobby-Electronics-1983-12-S-OCR Bassman 1.jpg Hobby-Electronics-1983-12-S-OCR Bassman 2.jpg Hobby-Electronics-1983-12-S-OCR Bassman 3.jpg Hobby-Electronics-1983-12-S-OCR Bassman 4.jpg Hobby-Electronics-1983-12-S-OCR Bassman 5.jpg

2 Replies

176 Views

Last post by Manfred
54 minutes ago
1976 Marshall JMP 50W Combo Master Volume Squealing

Last post by turbonigro « Today, 15:16
Posted in Amplifiers
Replies: 17
by turbonigro » 28 Jan 2022, 18:55 » in Amplifiers

This beloved amp is getting old or tired of my playing.
Plugging in into High Input and turning preamp pot from 8 to 10 behaves weirdly

loud squeal if cable is plugged in without an instrument;
with single coils middle pickup squeals and with bridge or neck pickup it has harsh sound when distorting;
with single coils turning down the tones remove the squeal;
With humbuckers there is no squeal at all;

Power tubes have been already replaced with matched EL34, bias 8uf caps replaced....

17 Replies

645 Views

Last post by turbonigro
Today, 15:16
Pigtronix Philosopher's Rock schematic

Last post by Lithium_Grim « Today, 11:43
Posted in Modern Stompbox Effects (1975 - ...)
Replies: 3
by apollomusicservice » 28 May 2017, 16:13 » in Modern Stompbox Effects (1975 - ...)

For reference only (and those who like zircons).

3 Replies

1455 Views

Last post by Lithium_Grim
Today, 11:43
Rockett Blue Note OD [traced]

Last post by twotees « Today, 03:13
Posted in Boutique Stompboxes dissected...
Replies: 52
by Greg » 11 Jun 2010, 09:37 » in Boutique Stompboxes dissected...
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Seljetnoma kindly sent me some detailed photos of his Rockett Blue Note OD (thanks Frank), and I traced it with his help.

Looks like it's the same board and circuit as the Rockett Animal, with different component values, so someone might like to work out those values from the pic in the other thread and we can solve that one also.

If someone does it and wants to send me the values I can easily update this schemo to the new values, and post it in the other thread.

Firstly.. here's a couple of...
52 Replies

29501 Views

Last post by twotees
Today, 03:13
A Switching Scheme [documentation]

Last post by twotees « Yesterday, 15:16
Posted in DIY Projects
Replies: 260
by mictester » 30 May 2011, 20:05 » in DIY Projects
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You'll all know my hatred of the crappy TPDT and similar footswitches.

I still have customers who insist on true bypass and a solid copper path bypass . Buffered bypass is almost always better, but just to satisfy these (very wealthy / influential) musicians, I frequently use bistable relays. Many players are deeply distrustful of mains powered effects, and (perversely) demand batteries that last for many hours. I also have a large supply of really sturdy SPDT footswitches (like the old...
260 Replies

57060 Views

Last post by twotees
Yesterday, 15:16
Colorsound - Fuzzphaze

Last post by modman « Yesterday, 10:56
Posted in Vintage Stompbox Corner ( ... - 1975)
Replies: 35
by pinkjimiphoton » 08 Nov 2011, 18:37 » in Vintage Stompbox Corner ( ... - 1975)
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hey guys,
anyone got a schem, layout and or gut shots of one of these beasts?

i hear it calling from beyond the grave....

jimi.....jimi...ressurect my ass....

please help if possible!!

i, myself, and me as well as the karma of the world will thank you...
35 Replies

9547 Views

Last post by modman
Yesterday, 10:56
Craig Anderton, Build the Optimum Fuzz Adapter, in: Popular Electronics, July 1972 🇺🇸

Last post by modman « 26 May 2022, 22:57
Posted in Davidoff Library

by modman » 26 May 2022, 22:57 » in Davidoff Library

PDF: Pop-1972-07 Optimum Fuzz.pdf

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Pop-1972-07 Optimum Fuzz 1.jpg Pop-1972-07 Optimum Fuzz 2.jpg

0 Replies

97 Views

Last post by modman
26 May 2022, 22:57
Andy Armstrong, Soft Fuzz, in: Hobby Electronics, July 1983

Last post by modman « 26 May 2022, 18:07
Posted in Davidoff Library

by modman » 26 May 2022, 18:07 » in Davidoff Library

PDF: Hobby-Electronics-1983-07-S-OCR Soft Fuzz.pdf
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Hobby-Electronics-1983-07-S-OCR Soft Fuzz 1.jpg Hobby-Electronics-1983-07-S-OCR Soft Fuzz 2.jpg Hobby-Electronics-1983-07-S-OCR Soft Fuzz 3.jpg

0 Replies

88 Views

Last post by modman
26 May 2022, 18:07
Spambot attacks on existing accounts

Last post by modman « 26 May 2022, 13:19
Posted in Stuff Seen for Sale
Replies: 1
by deltafred » 25 May 2022, 17:02 » in Stuff Seen for Sale

????????????????????????????????????

I would have reported it as spam except that the poster has been registered for 12 years. I suspect that the account may have been hacked.

1 Replies

124 Views

Last post by modman
26 May 2022, 13:19
J. McCarthy, Split Phase Tremolo, in: Practical Electronics, June 1980 🇬🇧

Last post by modman « 26 May 2022, 12:54
Posted in Davidoff Library

by modman » 26 May 2022, 12:54 » in Davidoff Library

PDF: Practical-Electronics-1980-05 Split Phase Tremolo.pdf

Practical-Electronics-1980-05 Split Phase Tremolo 1.jpg Practical-Electronics-1980-05 Split Phase Tremolo 2.jpg Practical-Electronics-1980-05 Split Phase Tremolo 3.jpg Practical-Electronics-1980-05 Split Phase Tremolo 4.jpg Practical-Electronics-1980-05 Split Phase Tremolo 5.jpg

0 Replies

87 Views

Last post by modman
26 May 2022, 12:54
OnkartGromt - Grombass v1 [traced]

Last post by wayshot « 26 May 2022, 11:08
Posted in Boutique Stompboxes dissected...
Replies: 1
by wayshot » 25 May 2022, 16:36 » in Boutique Stompboxes dissected...

First post from this long time lurker. I've had this bass distortion pedal for many years, but I still haven't seen anyone checking out its circuit, so I decided to try. It's handmade in Norway by the small pedal builder OnkartGromt. Info:

Getting the PCB out of the enclosure was quite a challenge, at least without de-soldering the DC input and the two mini-switches. But I wrestled it out and took decent pictures of both sides. Figured out the circuit, whose design is far from a typical TS...

1 Replies

238 Views

Last post by wayshot
26 May 2022, 11:08
jFet not opening completely

Last post by Manfred « 26 May 2022, 11:00
Posted in Pedal Debugging & Troubleshooting Support
Replies: 7
by Lithium_Grim » 25 May 2022, 06:24 » in Pedal Debugging & Troubleshooting Support

I want to make a tails switch for a DBD. There are multiple examples on the internet, but I just can not seem to get it to work correctly. Must be my lacking knowledge of transistors, so I am here to be taught :D

Attached a picture by R.G. Keen with a basic jFet switch as in boss/ibanez. If I am not mistaken when Vgs > V cuttoff the switch will be closed and if Vgs Closed
V control = ground (0V), Vref 4,5V makes Vgs 0-4,5 = -4,5V which is in the Vcuttoff range -> Open

However... which ever...

7 Replies

195 Views

Last post by Manfred
26 May 2022, 11:00
The Wishing Well: PT2399 True Stereo Reverb

Last post by Ripthorn « 25 May 2022, 18:13
Posted in DIY Projects

by Ripthorn » 25 May 2022, 18:13 » in DIY Projects

I apparently have a thing for delay/reverb circuits. I decided to do a true stereo reverb using PT2399. It's based on my Spare Room design, but it takes advantage of of the ability to cross feed the left and right signals and to do some cool cross channel-dependent modulation. It's not a small circuit by any measure. In fact, it may be the most complicated single knob pedal in the DIY world, but it's a fun one. The schematic is too big to post at reasonable quality here, but I put the short...

0 Replies

107 Views

Last post by Ripthorn
25 May 2022, 18:13
Boss - HM-2 Heavy Metal [schematic]

Last post by slammer88 « 25 May 2022, 17:38
Posted in Modern Stompbox Effects (1975 - ...)
Replies: 308
by Toasted » 06 Mar 2008, 16:38 » in Modern Stompbox Effects (1975 - ...)
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Hi guys, does anyone know any good mods for a stock Boss HM-2?

I'm especially looking to increase the bass response.

Cheers, Joe.

BOSS-HM-2-SERVICE-NOTES.pdf
308 Replies

217148 Views

Last post by slammer88
25 May 2022, 17:38
Power and Preamp Circuits, in: Electronics Today Internation, April 1980

Last post by modman « 25 May 2022, 09:29
Posted in Davidoff Library

by modman » 25 May 2022, 09:29 » in Davidoff Library

PDF: ETI-1980-04-80 UK Preamp and Power amps.pdf
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ETI-1980-04-80 UK Preamp and Power amps 1.jpg ETI-1980-04-80 UK Preamp and Power amps 2.jpg ETI-1980-04-80 UK Preamp and Power amps 3.jpg ETI-1980-04-80 UK Preamp and Power amps 4.jpg

0 Replies

191 Views

Last post by modman
25 May 2022, 09:29
Schematics to PCB Layout Software Automation?

Last post by Noguffay « 24 May 2022, 19:15
Posted in Software Room
Replies: 2
by Noguffay » 24 May 2022, 17:39 » in Software Room

Total newbie here. Never used a PCB layout app in my life. I can read schems, I can build some electronic devices and paint by number DIY pedals. I'm pretty good at soldering and reworking. But I've never delved into PCB layout apps.

Here's my question:

Can PCB layout software/apps now take a schematic and Automatically create a PCB layout from it? If so do free apps do this? Do any do this? Is it possible? I get that there will always be constraints. Like: I/O placement, PCB shape, footprint...

2 Replies

105 Views

Last post by Noguffay
24 May 2022, 19:15
Crazy Tube Circuits - Falcon overdrive (gut shots)

Last post by Ghandi « 24 May 2022, 14:46
Posted in Boutique Stompboxes dissected...
Replies: 4
by Patric2 » 14 Jun 2020, 18:49 » in Boutique Stompboxes dissected...

20200614_163920.jpg 20200614_163414.jpg
20200614_164905.jpg

I like the sound of this one, sorry about the crappy pics.
I can try to take better ones when i get the time.
Forgot to take pics on the potz boards other side...

Looks like charge pump, relay switching, 3 smd jfets, two 5k trimpots for the jfets.

Pots are:
Tone a500k
Output a25k
Volume a500k

Funny double decker board.

4 Replies

1370 Views

Last post by Ghandi
24 May 2022, 14:46
Tech21 Character Series [schematic]

Last post by daniellp « 24 May 2022, 13:11
Posted in Modern Stompbox Effects (1975 - ...)
Replies: 451
by bucksears » 10 Jul 2009, 15:28 » in Modern Stompbox Effects (1975 - ...)
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I'm half tempted to get a Liverpool just to see what's inside, but if someone has already had a look, I'd be interested to hear it.
Supposedly, some guy on YouTube bypassed the speaker sim so he could use it with his amp - that's what I'm looking for.
451 Replies

292117 Views

Last post by daniellp
24 May 2022, 13:11
Boss - HM-3 Hyper Metal [schematic]

Last post by m4268588 « 24 May 2022, 12:32
Posted in Modern Stompbox Effects (1975 - ...)
Replies: 24
by DimebuGG » 03 Jul 2010, 08:18 » in Modern Stompbox Effects (1975 - ...)
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I got a Boss Hyper Metal HM-3 for repair. While I was looking for a schematic online, all of them are just mere drawings of HM-2, therefore I decided to trace the unit...
24 Replies

16448 Views

Last post by m4268588
24 May 2022, 12:32
Way Huge Camel Toe Series/Parallel switch... has anyone figured out how it works?

Last post by karul « 24 May 2022, 09:45
Posted in Boutique Stompboxes dissected...
Replies: 8
by The Rotagilla » 21 May 2022, 23:27 » in Boutique Stompboxes dissected...

Hi,

I've been trying to figure out how Way Huge did the Series/Parallel toggle switch in the Camel Toe, either in the original or reissue. Has anyone traced that part of the circuit?

Thanks!

8 Replies

364 Views

Last post by karul
24 May 2022, 09:45
zonk machine question

Last post by bonehead1972 « 23 May 2022, 20:25
Posted in Vintage Stompbox Corner ( ... - 1975)

by bonehead1972 » 23 May 2022, 20:25 » in Vintage Stompbox Corner ( ... - 1975)

hey guys
i just built one, i tried a lot of transistors and finally got some nice sound out of it. bias voltages are ok, no ugly noises on the decay
its gated in a nice way, with a hint of octave up when i back the guitar vol pot a little....
what bothers me is on a certain combination on the guitar volume pot and the fuzz''/ bias pot in produces a kind of octave down sound which is actually very pleasant
my question is whether this is normal. i havent heard of a zonk pedal doing this

i...

0 Replies

134 Views

Last post by bonehead1972
23 May 2022, 20:25
DL-4 issue

Last post by Stevenrb718 « 23 May 2022, 19:24
Posted in Modern Stompbox Effects (1975 - ...)

by Stevenrb718 » 23 May 2022, 19:24 » in Modern Stompbox Effects (1975 - ...)

So I have a DL-4 that powers on maybe 1 out of 10 times. When it does power on, it works totally fine and indefinitely. Sometimes if I unplug it after working then plug it back in, it works. Most of the time it doesn't. After that, it seems like 2 consecutive times powering up is the limit. I've reseated the Eprom several times and thoroughly cleaned the pins. I reflowed all of the pins of the socket. I reflowed a few ICs around the Eprom to see if something was just making a bad contact. I've...

0 Replies

115 Views

Last post by Stevenrb718
23 May 2022, 19:24
Caline CP-18 Orange Burst Overdrive [schematic]

Last post by CheapPedalCollector « 23 May 2022, 07:24
Posted in Modern Stompbox Effects (1975 - ...)
Replies: 32
by Brink » 05 Sep 2013, 23:17 » in Modern Stompbox Effects (1975 - ...)
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TL;DR: Xotic BB Preamp
Differences from BB: 2x Tl072 instead of 1x 4558 + 1x Tl072. 2x C1815 instead of 2n5088. Larger power caps.

I bought one of these to see what it was.
2x TL072, 2 transistors (C1815). Pots are B100K volume, A1M gain, B50K treble, B50K bass.
Input cap is 22n. One IC has 2 Si diodes and a 51pf cap in the in the loop. One IC outputs to a 10uF cap into the volume control, which then goes to a 100n cap.

Cap markings:

2 ceramic caps
151
510

11 film caps
223
???, big, right...
32 Replies

17283 Views

Last post by CheapPedalCollector
23 May 2022, 07:24
Supreme Compressor (Engineer's Thumb) Distortion

Last post by Wake22 « 22 May 2022, 13:06
Posted in Pedal Debugging & Troubleshooting Support
Replies: 2
by Wake22 » 22 May 2022, 10:30 » in Pedal Debugging & Troubleshooting Support

Hello all.

I'd really appreciate some help with my build please, if possible. I have followed the troubleshooting steps in the FAQs but nothing seems to have had any effect. This is my first build with a PCB rather than a veroboard which I though would be more straightforward. That was certainly the kiss of death!

The kit is the Supreme Compressor from Effect Pedal Kits. It is based on the Valvewizard Engineer's Thumb, with 4 control knobs.

A lot of fuzz-like distortion is being produced...

2 Replies

125 Views

Last post by Wake22
22 May 2022, 13:06
Highway 89 Weird power issue

Last post by SpikeVelvet « 21 May 2022, 19:23
Posted in DIY Projects

by SpikeVelvet » 21 May 2022, 19:23 » in DIY Projects

I have built an old favorite from this board, the Highway 89 from Doug Hammond. This pedal kills. The tone is rocking and ballsy and the clean up is great!!

I was trying to let the other guitar player in my band use it and I discovered a really strange issue that we have tracked down to a power issue generally but do not know specifically what the problem is.

When it is powered from my old dinosaur SKB pedalboard the pedal works fine, as it does when I use a single Boss PSA 120 style...

0 Replies

111 Views

Last post by SpikeVelvet
21 May 2022, 19:23

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