Guyatone made a large number of pedals by there's surprisingly few schematics.

I started off looking at the Guyatone PS-001 Distortion but there's not a lot of PCB pics out there.

In the process I found some info on the sister pedal Guyatone PS-005 Overdrive. At times people have tried to guess what this one is as well

I managed to trace the structure of the circuit. It looks like a Boss OD-1 (ish) circuit with a Muff Tone control. Unfortunately no values.
guyatone PS-005 overdrive -...

Hi everyone

Ive been away for a long time but wanting to get back into the pedal scene.
Recently I lost my job and had a legal battle to fight about how that went down.
Now I am looking to take a career break and focus on things that make me happy (or happier)

I have a few ideas floating in my mind, resurrecting my old gigahearts_fx name and doing some pedals that people might even want to buy. hey, we can dream. To that end, I need/want some help with a circuit idea. I think I know the...

Looking for some pots like these. This is the PCB for the Roland G77

G-77-010-LRG-13.png

Got this in for repair. Main complaint: The Howling Adjust control doesn't do anything, whether with the fuzz, the wah or both engaged.

Very cool pedal - nice smooth wah, and a really nice octave-fuzz. The tone control blends in the octave very nicely. Even better, the fuzz and wah work really well together. But turning the Howling Adjust control has no effect.

I have uploaded the schematic (it is inside the bottom plate). Clearly a shortened Super-Fuzz like effect. The Howling control is the...

Hey - I have built these before, but it has been awhile. Got it all together and it sounds great, except when the Depth control goes past the 2 o'clock position it starts to thump, getting quite dramatic as the depth increases.

Voltages seem perfect - 9.2v in all the A voltage spots, and 4.6v at all the B voltage spots. Tried different chips, even a TL022 in place of the 062 with no change at all.

Checked for solder bridges and correct parts. Even moved the wires away from the 022 chip....

I was wondering if there were any sources for reverse engineering pickups? I've seen this page a bunch with it's table of vintage Fender pickup specs: but I was wondering if there were any resources like that for other pickups? I'm aware of this forum, but it's less focused on specs of existing pickups:

Things like, bobbin dimensions, magnet type, coil wire type, number of turns, etc... I basically want a FreeStompBoxes for pickups, but I'll settle for whatever I can get. haha

If anyone has some good pics of the part values please post them. It would be a big help - thanks!

While I've traced the circuit and I'm confident the circuit topology is correct, there are however many missing values. Some values are uncertain due to poor pics. Others I have outright estimated. That goes for both resistors and caps. I'm pretty sure the electros are correct.

To emphasize the incompleteness of the schematic I've only given it a draft version number of 0.1a.

The PCB pics come...

Factory Schematic:
Guyatone - PS-004 Flanger- factory schematic (1981).png

Enclosure Front:
Guyatone - PS-004 Flanger- enclosure front.jpg

PCB Top:
Guyatone - PS-004 Flanger - pcb top.jpg

PCB Bottom:
Guyatone - PS-004 Flanger - pcb bottom.jpg

Hi,

Here's a link to a dropbox folder with some guts of the Guyatone PS-007 Phaser, including a .svg file with the components values. I hope I did not mess with the color code though...

Guyatone PS-007 Phaser folder

Tracing ain't done, but it may be very close to Boss PH-1, or some other 4-stage FET phaser. The MA522 part is a low battery detection, see the schem I've made for the Guyatone PS-006 Analog Echo...

Enjoy!

it is from 19. APR 1978.

and mictester posted this schematic.....

enjoy :thumbsup

Boris

Hoping for some help with a Tayda printing file. I have a project that needs an Adobe Illustrator file formatted for Tayda UV printing and I have zero experience or access to Adobe. Is anyone willing to convert a regular PDF to the correct specs as a gig job? Happy to pay for your time as I need this doing urgently. Thanks!

Hello,
I don't have as much free time as some years ago so I'm selling my Transistor stock of 609 transistors in total.

I'm asking 75€ for all of them

Here is the list of what’s included:

SNALL SIGNAL TRANSISTORS

PART QT OBS
2N403 1
2N2222 2 the most commercially successful discrete transistor ever developed
2N3702 1 general audio
2N3904 9 Common, general purpose, VERY POPULAR
2N5087 5 Common, general purpose (BC560)
2N5172 5 Sam Ash Fuzz-Stainer, used in some WAH WAH pedals
2SA673 3...

Hello everybody.

Please excuse my english. It is not my motherlanguage. :-)

I already build a few pedals from pcbguitarmania and other sites. The only time i had to adjust something was when i build a phaser. In that case it was done by ear.

I`m not sure what to do with the three trimpots on the calvin vai.
How should that sound? Are there some voltages i should measure somewhere? Nothing about the pots in the building docs for that pedal.

Would someone be so kind and can advise on this?...

I put the Super Hard On inside a small 55x55x21 mm box and, not having the C5k, but also for reasons of limited available space, I would like to use one of the two very small pot of a Danelectro Rocky Road, one linear of 80kA and the other log of 80 kB. Which of the two is better to use to convert it to approximately C5k, the linear one or the audio one ? I tried a 5k resistor in parallel to 80 k linear pot between pin 1 and pin 3 but the excursion is not gradual and the gain increases only at...

I made some inroads towards tracing the PS-001 Distortion.

Turns out it is more than an MXR Distortion+ with a Muff tone control. Structurally it's more like a Boss DS-1.
(Given the similarity of the Guyatone PS-005 Overdrive to the Boss OD-1 it's not surprising there is some similarity to the Boss DS-1.)

Unfortunately there's some ambiguity regarding the tone control caps. (The two polyester caps on the middle-edge of the PCB where the wires are).

Enclosure:
guyatone PS-001 distortion -...