Hi everyone.
I have some questions for more experienced builders in the community, that may guide me to the right direction.

After having built several 9v pedals, lately I put my hand on higher dc voltage circuits mainly for use with line levels.
So I'm starting to think of a 12-15v bbd stereo delay unit.
I'm thinking of using the aqua boy lay out with 2 bbd ics (and the extra modulation tweek).

Do you think that the higher voltage will be beneficial for more headroom and less noise and...

S alut/ H ello from Paris

Let me share with you my problems as I couldn't find (yet) any solution searching the web.

I've built two overdrives in one enclosure (TS808 and KOT): each has his true bypass footswitch with led, but one global IN/OUT and a cascading order switch. Both circuits are built on one veroboard, inspired by the layouts of Guitar Fx Layout (great site!) with a common ground stripe , and a daughter board for the diodes so I can easily change them for more magic ones :wink:...

Hi!

I just got one in, and as being a fan of these CMOS pedals, I needed to trace it!

For pics just take a look at my instagram; User: bernardduur

Hot Tubes Nano.JPG

PDF - Radio-TV-Experimenter-1966-06-07 Audio Compressor.pdf

Radio-TV-Experimenter-1966-06-07 Audio Compressor 1.jpg Radio-TV-Experimenter-1966-06-07 Audio Compressor 2.jpg Radio-TV-Experimenter-1966-06-07 Audio Compressor 3.jpg Radio-TV-Experimenter-1966-06-07 Audio Compressor 4.jpg Radio-TV-Experimenter-1966-06-07 Audio Compressor 5.jpg Radio-TV-Experimenter-1966-06-07 Audio Compressor 7.jpg

Does anyone has pics of the pcb for this one (blue pcb)?

I found only these pics

I'd like to check what they changed from this one that has green pcb

Thanks

I'm experimenting with the EHX Small clone, but don't really understand why they put the transistor at the start of the circuit, why not just have a bit of filtering instead of the extra stuff.

Just curious.

I should add, I'm using two LM13700 OTA Ics instead of multiple CA3094s.

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!

Hadn't gotten around to post this one yet.
Another cheapo, yet not awful-sounding one.
The circuit does not seem to stray too far from your standard OD. It has a fairly flat freq response but a limited drive range.
I'll get around to modding it at some point, but the bastard crapped on me shortly after reassembling it and I couldn't be bothered to reopen it.

Trace double-but-not-triple-checked. Pinch of salt, etc.

Have a nice one!

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

Howdy!
I like the look of the Urei Mod One discrete opamp. It uses 5 BJT transistors.
My question is how do I adapt this circuit to germanium BJT transistors? Got a bunch of Soviet ones and would like to use them! I am trying to learn the math behind it, so I'd like to learn why/how it works or doesn't work.
Can I reverse engineer from silicon BJTs? (Essentially the opposite of this:
Thanks for your help in advance!

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: Hobby-Electronics-1981-12-S-OCR Graphic EQ.pdf

---
Hobby-Electronics-1981-12-S-OCR Graphic EQ 1.jpg Hobby-Electronics-1981-12-S-OCR Graphic EQ 2.jpg Hobby-Electronics-1981-12-S-OCR Graphic EQ 3.jpg Hobby-Electronics-1981-12-S-OCR Graphic EQ 4.jpg

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...