Hi,

I'm interested in building a fuzz circuit based on the schematics here:

Simplicity is the goal. I would like to replace the 10K bias trimpot on the Q2 emitter with a fixed resistor. What value do you recommend? I will be using 2N3904 transistors.

Thanks,
SD-1

Hey I'm new to this forum.
Just wanted to show my first build, which is a noise generator.
I made it during the course of a week long workshop with American artist Derek Holzer (
at the Moddr lab from Worm in Rotterdam.

I have a 4093 Quad Nand Gate which I'm using to generate oscillations, and regulate them. Gate 2 regulates gate one, and gate 4 regulates gate 3. I have a 100k pot on gate 2, and another on gate 4. I also run the signal through a Light sensitive diode (in series to the second...

I think this is one way to power op amps with +/- 15V (probably better for big enclosures). I traced this power supply from a mixer I have:

I have not built it yet to check for mistakes. Does it look correct?

Anyone ever draw or build a pedal with the preamp section of those amp ?!?!?
At low volume, I have to say it was one of the best solid state drive I ever heard.
As an amp, as soon as you drive the volume, the sound got thin and agressive.

As a pedal, I assume it will be really effective, and versatile.

Here is the schematic of the entire amp.

Anyone know what should be withdraw to get a Rocpro in a box ?!?!?

thanks

This is where it all began to me... Below are two scans from an april '93 french science magazine called Sciences et Vie .

Dad's still receiving them at home... I kept this one with me until today, and still it makes me feel nostalgic...

At that time, the author, named Henri-Pierre Penel, was writing lots of articles with various builds (not only electronics) and even with some BASIC programs... Quite old indeed...

I was 13 then, and did not even play guitar... But 3 years later, being...

I learned about these DC to DC voltage converters recently:

So, I think you could run your op amps at +/- 15VDC this way, from a 9VDC input!

Like this?:

The catch is I guess you have to keep the current draw below 33mA.

REHOSTED: Practical Electronics, D.C. Hamill, Waa-Waa pedal, July 1970
--------
Hey all,

While searching google for something completely different (I was looking for a theremin and transistor organ schematic?)
I came accross this article for a 1970's Prescription Electronics Waa Waa circuit with schematic & vero layout included here and couldn't find it in the search so thought there might be some interest in it!

Cheers,

Scruffie.

Okay... how about a different scheme for making delay:

This may be old news to some of you, but to me it's new and exciting!

So the gist of the article is that the filter can predict the input with some accuracy for bandlimited signals, thus the output comes before the input. Yay cool time machine, whatever. The interesting part for me is the time delay graph with it's loooong delay time. Now I realize that this is for a bandlimited signal, and also a low frequency filter, so just putting...

I've been working on this project and need some help with a wiring diagram.
It's a box with:
1. 2 true bypass loops with a trim pot and feedback loop pot (with on/off toggle) on each loop with LED
2. A guitar volume switch for that rolled back tone with 2 color LED
3. A or B, A & B amp switcher with 2 color LED for A or B and LED for A & B
4. Master bypass for to loops only with 2 color LED
5. Tuner/mute out with 2 color LED

Anybody out care to take a stab at this?

convertor box that will allow me to toggle between switch position #1 being a straight-ahead continuous CV controller (output for 0v...+5v) using the expression pedal; and switch position #2 switching on an internal LFO output to CV allowing the expression pedal to control the LFO speed.

The Line 6 Expression pedal has a TS 1/4 inch plug and measures as a 10k ohm pot inside. Is there a simple LFO circuit that would work that can output CV voltages?

Has anybody tried John Hollis's Omnidrive? I've read mixed reviews elsewhere, but hoping for opinions from some of this forums esteemed members.

Can be found here:

Found this veroboard layout for a pedal called the Phaeton Big Hare, Can't find a company called phaeton on google but i'm gunna assume its a distortion by design and its name. The layout is by R.M Rivers ? Anyone familiar with his work ? Just was interested in it and maybe its a hidden treasure... although i highly doubt it.

Thanks,
Scruffie.

Inspired by a query on DIYstompboxes, I drew this:

I call it the Bufferer as in more of a buffer because... it can drive an 8 ohm speaker. 1M is a gain control, from unity (max resistance) to 20. 100p cap adds brightness at low gain settings.

Intended uses:
Driver for very long cables, power amplifier.

MODS
-minimal parts, buffer only: remove D1, C1, 10M and 10k resistors, 100p, 0.1u and 10u caps. Battery or regulated supply only, no reverse polarity protection, no treble boost.
-two...

I have a Peavey Classic 30 with stock footswitch for channel change and I would get this:

I would like to associate an effect pedal for each channel, so that when i select the channel 1 works the pedal effect 1 and when i switch to Channel 2 works the pedal effect 2,by turning off the pedal 1 automatically.

I have a Ibanez LS10 Dual Loop Selector. Can i use it for my intent without i make other purchases (looper,routing etc...) ?

thanks,jon.

Hello,

I was wondering if it is possible to build something that would switch between two effects with one footswitch? Maybe it's been done, and I can't find it.

What I would like to be able to do is make a box that would have loop A (fuzz pedal) and Loop B (octave fuzz) but since I never use the two together set it up to select one or the other with one footswitch.

Any help would be cool.

Thanks,
Trav

any body know whats going on here??

seems interesting... combine it with a two knob fuzz and get a two joystick fuzz crazyness....

:blackeye :applause: :hmmm:

Here's a novel distortion circuit built around the triangle/sine converter I used in my Infinite Flanger project.
For that use see:

The triangle/sine converter on it's own actually works without batteries! It needs a high signal drive (humbuckers) and it loses a lot of level though.

So I knocked up a simple booster circuit to drive the converter. In this form it works pretty well with a wide range of 'crunch' from gentle to quite hard. I don't have any way to make audio samples but it's...

This came up in another thread and I wanted to make sure the latest version was being referenced.

Hey guys. This is my first post here so I thought I would try to contribute a little. I have been lurking for awhile now and I'm very impressed with this site. I know this is not exactly a stompbox, but the premise is the same. Try to be kind with your comments to my design as I am not an engineer and I don't have much experience. I pieced different peoples schematics together to get this so I don't take much credit for the design.

I worked up this little headphone amp so I could sit and play...

I believe more diyers had the same issue, the trem was just a lucky side effect using the exact transistors andrew used. So getting it to work might just mean trying a lot of mpsa13's

Just a concept, not tested, might not work:

Basically a TS-style gain stage with clipping diodes, but instead of the cap/resistor to ground to determine the gain and frequency response, a gyrator circuit is used. This should give a midrange peak that is sweepable from 450-2000 Hz (based on values from the GEOFEX page on EQ, peaks and notches... thanks RG!) and can be made wider or narrower.

I think it might sound kinda like a stuck wah at certain settings, then kinda like a typical TS in...

I've been wanting to build a Thor for some time now, but I don't really think that I need the bass boost section. What would I need to do to build it without the bass boost section?

I drew up a schematic, leaving out what I thought should be left out, but I'm sure I've done it wrong :slap: .

Here's a link to the schematic I drew:

Could somebody give me a hand and explain to me how I should do this?

Im looking to build this project:

The 4pdt I have has a different pinout of the one shown...

it looks like this

with two rows of six pins

Thanks in advance!!!

this doesnt really fit in any catagory but here goes anyway....

A friends asked me if i could make a stomp switchable multi box to control his lighting rig while playing at gigs.
so he wants 6 stomp switchable power outlets each controlling a different stage light/laser/strobe ect

I'm an apprentice electrician so the wiring and construction should be straight forward, most of the stomp switches I've seen are rated at 2A/250VAC (mains is 240V 50Hz here in NZ, cutting it too close?)
so...