Hi!

My Zonk Machine started oscillating/squealing and producing static noise when attacking the strings. I didn't use the pedal for a while and wanted to put it on my board again.

The squealing is even heard when the pedal is off. The battery is new and works fine in other Tone Bender style pedals.

I made a short video of the issue:

Any ideas what could be causing this issue and how to fix it?

Thanks!

I quite liked the stock sound on this one. I am using it more than my TS9 lately...
Should not be too hard to convert into a better thing though. PCB looks neat, no brittle feel or artifacts.

Mod ideas are more than welcome :)

Cheers!

Hello.
I have analyzed the schematic of a TBCFX mep3 pedal I have on hand.
The FET was unknown.

I will share it with you since I have it.

I am using translation software for this text.
Please forgive me if the text is strange.

PDF: Hobby-Electronics-1979-06-S-OCR Tremolo Unit.pdf

Hobby-Electronics-1979-06-S-OCR Tremolo Unit.jpg

I’ve been dinking around on a fuzz face on a breadboard for a few days now. I’ve got it pretty dialed as to how I want it at this point. One problem though no matter what I’ve done doesn’t seem to change. When I use my strat (stock 2020 players) if I turn the volume knob below about 8 I have no sound unless I have the fuzz turned all the way up (I initially was following the directions from small bear that says use a 1k anti log so this makes the turn it all the way up even worse I think, I...

PDF Poptronics-1980-06 wah wah.pdf

Poptronics-1980-06 wah wah 1.jpg Poptronics-1980-06 wah wah 2.jpg Poptronics-1980-06 wah wah 3.jpg Poptronics-1980-06 wah wah 4.jpg

hsr_84_03-44.jpeg hsr_84_03-45.jpeg

PDF: Poptronics-1974-03 tremolo adapter.pdf

Poptronics-1974-03 tremolo adapter.jpg

PDF: Elektor-1979-12 Talk funny.pdf

Elektor-1979-12 Talk funny 01.jpg
Elektor-1979-12 Talk funny 02.jpg
Elektor-1979-12 Talk funny 03.jpg

Anybody have the schematic for the Yamaha DSC-20M chorus pedal? Pedal works under battery, but plugging adapter in kills all life; D2 diode also does not look original.

PDF: Practical-Electronics-1975-08 Fuzz effect.pdf

----

Practical-Electronics-1975-08 Fuzz effect.jpg

Hobby-Electronics-1981-07-S-OCR Treble Booster.pdf

Hobby-Electronics-1981-07-S-OCR Treble Booster 2.jpg Hobby-Electronics-1981-07-S-OCR Treble Booster 3.jpg

PDF: Pop-1972-07 Optimum Fuzz.pdf

----

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

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...

PDF: ETI-1980-04-80 UK Preamp and Power amps.pdf
--------
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

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...

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...

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...

I got this unit in and it sounds great on the bass

I was expecting more of an Overdrive unit but I got a distortion pedal. Sounds also great on guitar!!

Trex - Bass Juice.JPG

Hi all, my line6 m13 has blank lcd screens. The colours still change and the effects all still work. But unfortunately the lcds are either blank or sometimes all black. Looking online it seems like a few people has this issue but I haven’t found a way to repair it yet.
Does anyone have any advice? Thanks

This is side A of the Duellist dual pedal released as a standalone effect. It's got a couple of changes from what's inside the Duellist, but overall pretty close.

king_tone_soloist_trace_schematic.png

Basically a stripped-down Tube Screamer (Son of Screamer) with several tone options.

Full tracing journal: (includes Duellist and Heavyhand)

PCB:

This is side B of the Duellist dual pedal released as a standalone effect. It's got several tweaks & added features from what's inside the Duellist, so not a direct clone, though pretty close.

king_tone_heavyhand_trace_schematic.png

Basically a Bluesbreaker/Prince of Tone with a clipping diode switch and a few different pre-clipping tonal options.

Full tracing journal: (includes Duellist and Soloist)

PCB:

Hello all,

does anyone know this pedal Effettidiclara AGATA from Italy?
It is a boost/driver with 2 gain stages.
Does anyone have a schematic or an idea what kind of circuitry might be inside?

BR Stingray

I've been looking at the Marshall shredmaster for a while, but as used gear prices have reached questionable highs I'm looking at alternatives. I have heard the Truetone Jekyll & Hyde is a TS-like on the overdrive side, and based on the shredmaster on the distortion side.

Do any of you know how different the Truetone and Marshall pedals are? Is it a direct clone? Just wondering if it's worth getting the Marshall.

Here's an odd one
made in Italy, with help from Gary Hurst.

FP1.jpg FP2.jpg FP3.jpg FP4.jpg FP5.jpg FP6.jpg