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Thurlby Harmonic Multiplier (octave-up and ring mod)

Last post by JustinFun « 24 minutes ago
Posted in Vintage Stompbox Corner ( ... - 1975)
Replies: 5
by mauman » 09 Sep 2024, 20:16 » in Vintage Stompbox Corner ( ... - 1975)

This vintage octave-up/ring modulator showed up on Reverb for just a few days. Here are the seller's pics if anyone wants to trace it. The only adjustments are two trim pots. The instructions are posted on Effects Database and are included here for continuity. Apparently Thurlby is still in business in the UK, as Aim-TTi (Thurlby Thandar Instruments) which manufactures test equipment and power supplies.

Thurlby front.png
Thurlby angle.png
Thurlby jacks.png
Thurlby back.png
Thurlby...

5 Replies

1293 Views

Last post by JustinFun
24 minutes ago
Germanium and Silicon diodes comparison [documentation]

Last post by thomasbe86 « 58 minutes ago
Posted in DIY Projects
Replies: 37
by thomasbe861 » 13 Oct 2023, 10:01 » in DIY Projects
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Long story short, I ended up testing and measuring a good part of all odd diodes I have had accumulated over the decades of tinkering.
Some are modern, widely available, some are more rare and not produced anymore, germanium, silicon, including Schottky, silicon carbide, Zener, LEDs, IR, etc.
Here are the graphs, showing the forward voltage drop for a given current (I-V curve) for different types of diodes. Hope this is helpful to anyone. All were measured using a Peak Atlas DCA75 Pro.

The...
37 Replies

26138 Views

Last post by thomasbe86
58 minutes ago
MXR RR-104 Randy Rhoads Special Edition Distortion+

Last post by CheapPedalCollector « Today, 08:28
Posted in Modern Stompbox Effects (1975 - ...)
Replies: 13
by rmroza » 30 Aug 2024, 13:28 » in Modern Stompbox Effects (1975 - ...)

Getting this thread started as a new release that is getting a LOT of attention and I don't see any discussions yet on FSB!

13 Replies

2121 Views

Last post by CheapPedalCollector
Today, 08:28
tc scf debugging -- dc offset

Last post by jay42 « Yesterday, 22:49
Posted in Pedal Debugging & Troubleshooting Support

by jay42 » Yesterday, 22:49 » in Pedal Debugging & Troubleshooting Support

I have an old Type P210 tc scf. The gain pot went open and I had to tear it apart to clean and lube the pot. All that done, I did some scoping and measuring and found that it's putting a DC offset at the outputs. The offset starts at 7V (roughly half of 15V) and decreases very slowly. I replaced the most obvious cap and that didn't help. Even when unplugged with a shorted input, it takes about an hour to get back to 0.0V.

The schematics are difficult to read, however, it appears that the...

0 Replies

67 Views

Last post by jay42
Yesterday, 22:49
Forum Maintenance & Development News/Announcements

Last post by Cub « Yesterday, 19:32
Posted in Announcements and Forum Rules
Replies: 30
by The G » 19 Aug 2020, 05:39 » in Announcements and Forum Rules
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Just did update the forum to the last version of its software. It was completely uneventful on our side, but if you notice something not right, please let us know.
Thank you!
30 Replies

25603 Views

Last post by Cub
Yesterday, 19:32
Demo amp

Last post by mauman « Yesterday, 18:41
Posted in DIY Projects
Replies: 4
by vprjs » Yesterday, 00:27 » in DIY Projects

Hi there. I want to build a sort of demo amp . I want to use it to try circuits on a breadboard. I found 4 inch regular speaker. And want to put a ruby amp inside. Do I need to add a low pass filter to this circuit to cut non-guitar high frequencies?

4 Replies

257 Views

Last post by mauman
Yesterday, 18:41
DELAY REBOTE 3 - Troubleshooting

Last post by Gebrey « Yesterday, 16:12
Posted in Modern Stompbox Effects (1975 - ...)

by Gebrey » Yesterday, 16:12 » in Modern Stompbox Effects (1975 - ...)

Hello everyone,
I started advanced projects since I crafted tons of simple and intermedium pedals and amps.

This is a really challenge since there are a lot of components.

Here the schematic:
20240804_173822.png

Here my DIYLC layout:
20241007_172204.png

Here the bottom DIYLC of the board already flipped & real pcb bottom
ZomboDroid_07102024052718.jpg

Here a comprehensive photo of the setup:
20241007_171419.jpg

It doesn't work properly.
The diagnosis:
- original signal pass...

0 Replies

116 Views

Last post by Gebrey
Yesterday, 16:12
BAJA REACTOR 010119 [documentation]

Last post by tuck « Yesterday, 07:39
Posted in DIY Projects
Replies: 78
by bajaman » 01 Jan 2019, 06:47 » in DIY Projects
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Happy New Year to all the good folks here at freestompboxes.org.
Here is a new design that I have been working on over the last few years - a pedal designed to mimic the performance of a typical negative feedback tube amp power stage driving a Celestion quad box or similar.

The pedal has the negative feedback presence and depth (resonance) controls typical of Soldano, Marshall, Fender, Peavey etc.

Tube power amplifiers have a high output impedance compared to solid state class AB and digital...
78 Replies

80270 Views

Last post by tuck
Yesterday, 07:39
Another modification of fuzzface

Last post by Vitallka « 06 Oct 2024, 18:11
Posted in DIY Projects
Replies: 2
by Vitallka » 28 May 2023, 17:30 » in DIY Projects

Hi to all.
Fuzzface has undergone so many modifications, so only mine is missing :D
I set out to redo the fuzzface in a way that would be easy to repeat and not sound as sharp as the silicon transistors. Therefore, I decided to add zener diodes between the base and the collector and it softened the sound. Also, the capacitor at the input is also of reduced capacity so that there is no excess of low frequencies.
Here is the modification scheme:

And here is the video:

Criticism and...

2 Replies

1925 Views

Last post by Vitallka
06 Oct 2024, 18:11
AMT - Legend Amp Series 2 [traced]

Last post by TNT_2 « 06 Oct 2024, 17:58
Posted in Boutique Stompboxes dissected...
Replies: 146
by J0K3RX » 30 May 2015, 13:53 » in Boutique Stompboxes dissected...
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Lookie what I found..... :twisted:
146 Replies

197061 Views

Last post by TNT_2
06 Oct 2024, 17:58
Earthquaker Devices - Palisades [traced]

Last post by Grrrg « 06 Oct 2024, 14:34
Posted in Boutique Stompboxes dissected...
Replies: 42
by JorisBlack » 08 Jun 2014, 21:51 » in Boutique Stompboxes dissected...
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Hey all,

I'm looking for a schematic (or even better: a vero layout) of the Earthquaker Devices Palisades overdrive. This thing is a PGS exclusive, which is pretty annoying, especially for us outside the US.

There is a gutshot in the pgs demo, but I doubt it will be useful... (gutshot at 1:45 --> )

Any help is appreciated :thumbsup
42 Replies

27193 Views

Last post by Grrrg
06 Oct 2024, 14:34
Fishman Universal Rechargeable Battery Pack

Last post by ABtheBassPlayer « 06 Oct 2024, 01:10
Posted in Electric Guitar/Bass Wiring
Replies: 12
by ABtheBassPlayer » 12 Aug 2023, 18:46 » in Electric Guitar/Bass Wiring

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!

12 Replies

3863 Views

Last post by ABtheBassPlayer
06 Oct 2024, 01:10
Electro Harmonix Bass Big Muff [schematic]

Last post by jeepe « 05 Oct 2024, 14:51
Posted in Modern Stompbox Effects (1975 - ...)
Replies: 17
by dylan159 » 26 Apr 2021, 14:18 » in Modern Stompbox Effects (1975 - ...)

I haven't seen this one here already, so I gave it a trace both for personal fun and curiosity:

bassmuff.png

Some values aren't there because they weren't marked on the silkscreen like the others, and I'm not going to pull them out to check. You get the gist of it though: they basically doubled up most caps with another one in parallel. The tone stack is a flatter variant. The bass boost literally mixes some lowpassed signal with the tone stack output. The parallel dry blend is done in a...

17 Replies

14182 Views

Last post by jeepe
05 Oct 2024, 14:51
Mike Pope - Flexcore

Last post by LuisMerino « 05 Oct 2024, 07:08
Posted in Electric Guitar/Bass Wiring
Replies: 7
by difesa98 » 08 Jan 2024, 11:35 » in Electric Guitar/Bass Wiring

Hi!
i bought an used Mike Pope Flexcore and i want to obtain the schematic in order to simulate it via spice and see the frequency response. Here it is some high quality photos, i've already traced it (red=upper layer, blue=bottom layer) and i tried using fiverr for the EQ section , the pcb where is located the quad-opamp (there is an error in the fiverr schematic: seeing the 6 holes the guy thought of a stereo pot but in reality the EQ pcb is used either with the bass control or a concentric...

7 Replies

2929 Views

Last post by LuisMerino
05 Oct 2024, 07:08
Diamond Bass Comp

Last post by Paul_5 « 04 Oct 2024, 21:21
Posted in Boutique Stompboxes dissected...
Replies: 70
by lohstah » 28 May 2011, 17:19 » in Boutique Stompboxes dissected...
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for you bass lovers out there.

Diamond Bass Comp Values.jpg

cheers,
lohstah
70 Replies

52594 Views

Last post by Paul_5
04 Oct 2024, 21:21
MXR - M-118 Analog Delay SAD1024 [schematic]

Last post by Fernando JFET « 04 Oct 2024, 14:42
Posted in Modern Stompbox Effects (1975 - ...)
Replies: 14
by musopaul » 12 Oct 2013, 13:51 » in Modern Stompbox Effects (1975 - ...)

Hi there,

I have a green box MXR 118 Analogue delay that i have brought back from the dead and am trying to align but cannot find the alignment procedures for clock frequency and location of trim pots anywhere...

It is the SAD1024 version with 118-3001 102 board.

I have found a couple of alignment sheets on here but they are for the PT2399 modded version and refer to trim at point A with no reference to what point A is.

Thanks,

14 Replies

64942 Views

Last post by Fernando JFET
04 Oct 2024, 14:42
Help finding a BBD for flanger?

Last post by modman « 04 Oct 2024, 09:17
Posted in Pedal Debugging & Troubleshooting Support
Replies: 1
by audiodude » 02 Oct 2024, 21:36 » in Pedal Debugging & Troubleshooting Support

Hello,
I want to revive my Big Jam SE-5 flanger pedal. It uses the SAD512d (8-pin chip, different from the original SAD512) delay line, and it appears that's the component that's gone faulty in my unit. It seems these chips are commonly failing now, and unfortunately appear to be rare and expensive when they do work.

I've seen that the R5106 was a drop-in replacement chip back in the day, but even those are scarce now.

But I've also heard that the RD5106ANP should work (though the datasheets...

1 Replies

368 Views

Last post by modman
04 Oct 2024, 09:17
DSM & Humboldt Simplifier

Last post by ody « 03 Oct 2024, 20:16
Posted in Boutique Stompboxes dissected...
Replies: 27
by Saruman » 31 May 2022, 12:22 » in Boutique Stompboxes dissected...
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Hi! I have an interesting device. I started working on drawing his schematic. Everything is clear. Give me time and I'll draw a diagram. If someone already has a scheme, we will cooperate. :horsey:
27 Replies

6963 Views

Last post by ody
03 Oct 2024, 20:16
How to disassemble Big Jam pedals?

Last post by audiodude « 02 Oct 2024, 20:59
Posted in Modern Stompbox Effects (1975 - ...)
Replies: 1
by tktk » 28 Sep 2024, 13:02 » in Modern Stompbox Effects (1975 - ...)

Do I need to unsolder the jacks?

1 Replies

486 Views

Last post by audiodude
02 Oct 2024, 20:59
Simple Buffered Splitter

Last post by J4mes « 02 Oct 2024, 18:00
Posted in DIY Projects
Replies: 14
by culturejam » 30 Aug 2011, 15:29 » in DIY Projects

This is a very simple buffered splitter project. You can use it to create two equal outputs for your guitar or another pedal. This is handy for running a stereo amplifier setup, splitting a single signal into two effects pedals, or any of several other applications in which you need to have two equal, buffered outputs. The circuit consists of a simple transistor input buffer that feeds a pair of parallel op amp-based output buffers.

From an EE perspective, this isn't a perfect circuit. From a...

14 Replies

5665 Views

Last post by J4mes
02 Oct 2024, 18:00
Mutron filter in Ken Smith bass

Last post by drewl « 02 Oct 2024, 16:07
Posted in Vintage Stompbox Corner ( ... - 1975)
Replies: 6
by drewl » 09 Sep 2024, 18:28 » in Vintage Stompbox Corner ( ... - 1975)

What sort of psychotic madman would do this....
I've worked on Mutron Filters over the years, including a month ago but this is insane.

They stuffed it in the control cavity
Topology looks different, three batteries - one for the LED's, two for power or it has a separate power supply box with multi pin cable.
Several intermittent things, looks like a severe pain to work on.

6 Replies

640 Views

Last post by drewl
02 Oct 2024, 16:07
Germanium in my attic

Last post by jalmonsalmon « 02 Oct 2024, 02:56
Posted in Vintage Stompbox Corner ( ... - 1975)
Replies: 19
by RuptorGB » 07 Sep 2024, 11:54 » in Vintage Stompbox Corner ( ... - 1975)

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...

19 Replies

2073 Views

Last post by jalmonsalmon
02 Oct 2024, 02:56
Engineer´s Thumb - Compressor kit - not working

Last post by Rebuilder « 01 Oct 2024, 19:07
Posted in Pedal Debugging & Troubleshooting Support
Replies: 6
by Rebuilder » 15 Nov 2023, 09:27 » in Pedal Debugging & Troubleshooting Support

Hi guys, i have here a musikding Engineering thumbs Compressor kit that is not working!

Schematic:

Guts Shot

Since i’m not the one who mounted the kit, i checked every component polarity etc. resolder a bunch of holes, and identified a wrong transistor in the circuit. It was with a BC337 instead of a BC327.
I changed the transistor, but its somehing else wrong.
I have bypass sound. When its on, seems like there’s no effect applied. Level pot its working , the other ones i can’t notice...

6 Replies

1419 Views

Last post by Rebuilder
01 Oct 2024, 19:07
Joyo JF-26 Tiny Huge Fuzz (gut shots)

Last post by howmuch « 01 Oct 2024, 15:01
Posted in Modern Stompbox Effects (1975 - ...)
Replies: 2
by houseofglass21 » 06 Feb 2024, 18:54 » in Modern Stompbox Effects (1975 - ...)

New Joyo fuzz that I just got from Amazon. It’s definitely a big muff clone of some sort. Someone on Reddit said it was a Swollen Pickle clone and I don’t hear that at all. Probably just taking that from the name. I had the original three knob Swollen Pickle and it was literally the most bassy and scooped pedal I've ever used. 100% unusable in a band setting, my guitar was gone the second I stepped on it. This Joyo has good midrange content and tons of gain. Sounds like a rams head or triangle...

2 Replies

1520 Views

Last post by howmuch
01 Oct 2024, 15:01

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