a pedal released in Brazil by Roland, exact copy of boss sd1

Hi, gang!
For this post, I present a mystery! I have a fully populated FX PCB w/ connected pots that I would like to identify. The only marking is JCW (or perhaps JCW II), and 1983. As you can see in the pictures, the board features a couple NE5532 dual op-amps. I think the two nice sealed pots (both 10K-S, 1/8 shaft) might be original, but the two dual 100K pots probably aren't. I seem to remember Radio-Shack selling that exact same dual 100K (41-step detent, 40% tap). Let me know what you...

It’s been a couple of years since I’ve made the first Pelota delay: from the very name, it was a circuit inspired by a few popular PT2399 delays, such as the Rebote series, the Deep Blue Delay, and many others that aren’t that different to be worth mentioning.

Even then, with my more limited experience and knowledge, I knew I could try to do better, starting from the awful, noisy, high resistance inverting input stage you find in the vast majority of them that makes you wonder who did it first...

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...

Radiopratica 1970_08 Bizar Sounds.pdf

Radiopratica 1970_08 Bizar Sounds 01.jpg Radiopratica 1970_08 Bizar Sounds 02.jpg

Howdy!
My Supa-Puss with not keep time with either the tap tempo or knob. Whatever the setting, it reverts to a rapid blinking/tempo. Changing the power supply does not seem to have an influence on it. Before I send it off to Dunlop or my computer repair guy, I'd like to take a shot at fixing it.
Please point me in the right direction!

Thought I'd pick up one of these to see what it's like.
I was hoping I'd be lucky and it would be a take on the Moen Shaky Jimi/Jimi Nova, which are based on the EasyVibe.
Here's links to the Moen Shaky Jimi and Moen Jimi Nova threads.
And I'd like to thank John Hollis for his lovely EasyVibe circuit. :thumbsup

What's inside then? The highlights:
1 x ST 064C
3 x TI TL062C
4 x LED/LDR pairs

It does indeed look to be generally based on the Moen/EasyVibe circuit although I haven't checked the...

Peavey, Pavey, Pevy, or is it Pee-vee? One of my favorite amplifiers is still to this day the Peavey Bandit 112 I was gifted for a birthday. That was my first actual guitar amplifier, but even after having the chance of playing and owning fancier, more expensive, more tube amplifiers, I still come back to this one once in a while. Having made a cab sim, I thought it would be nice to have a pocket size version of the pre-amplifier to use with it without bringing the whole amplifier with me....

Hallo everyone,
I started my amp builder career with ROG Ruby, then Noisy Cricket, then Tube Cricket, then I moved to higher voltage amp IC: TDA 20x0.

I've built a bridge dual supply TDA2050 AMP. Until I supplied with 36V and voltage divider (low current, ±18V) it worked as expected and louder.

tda2030-bridge-amplifier.jpg

Then I moved to transformer ±18V and 6 elna 10mF filter caps and... probably I cooked my ICs.

20230206_171832.jpg

A bit disappointed, I bought 2 modules from...

Old Blood Noise Endeavors - Haunt Fuzz v1 tracing. This came from an early pedal with low double-digit serial number in a light blue enclosure.

Notes:
1) Enclosure labels for 'Low' and 'Mode' appear to be reversed. Documentation states that 'mode' switches between two different silicon transistors. I found these transistors are actually connected to the toggle switch labeled 'low'. There is a difference in breakup and gating at each transistor setting. The 'mode' toggle switches between two...

Still going through old files.
The preamp which is in the Ashbory bass (the little dogbone shaped thing with silicone strings), piezo pickup.

Despite having been around for some years, there's still an aura of mystery around waza craft BOSS pedals. What do they have in common, what is the waza factor? What do the custom modes even do?
There's some info thrown around about CCS-loaded buffers, which are nice even if unnecessary for guitar, and they're still just buffers. Is that it?
That said, I have the luck of having a friend who owns the DS-1W and who let me borrow it for tracing without begging too much. Thanks to him, and my hard...

Over time these seemed to have disappeared from the web.

dayellowhumper.jpg
daredranger.jpg
dapurplepeaker.jpg
daorangesqueezer.jpg
dagreenringer.jpg
dablueclipper.jpg

Hello,
I m a beginner in diy kit pedal, and I ve try the octavius kit from pcb mania.

I have some problem like no sound when I activate the pedal.

First question, how should I put the diode 1n34a ?

the two lines on the side indicated on the circuit?

it seems polarized upside down?

and I have a doubt about the connection of my switch.

if not where to look?

Thanks for your help...

Hi all. I am having some issues with my Wolfgang 61 build. I posted on Reddit and I'm trying to repost here for help. There's a video posted over there that clearly shows the issue:

TLDR:
L channel seems fine, R channel seems ok until input gets too hot and then sounds blown out. Overall both channels have a noticeable volume drop from clean.

Just got these from an eBay auction the other day, thought it was pretty funny. They're definitely Russian 6p6s tubes. Would've been a cool light show if I put them in my bass amp and biased like a 6l6gc. The one on the right is the same thing, but labeled realistic brand 6v6.

Hello people.

I am trying to fix a Fender practice am with a loud hum noise.
the amp works but it has a hum noise (50hz) loud even when the guitar is unplugged.

- Volume, Contour, Reverb doesn't affect the noise.

I had attached the schematic for the amp Fender R.A.D. that is the same without the reverb circuit.

I tried to connect the preamp output to another amp and the noise still there. My first thought the issue is in the power supply I changed all the electrolytic capacitors in the...