Hi folks
As promised my version of the KORG CX3 1980's portable organ Rotary Effect.
This is definately not a project for beginners ( not another fuzz face or thuper hard on :wink: ), but if you are up to it, you will be rewarded with beautiful Hammond Leslie speaker cabinet type tones.
I have kept it as close to the original KORG circuit as possible, with the following changes - an additional n channel jfet buffer at the input, a simpler fast/slow speed switching arrangement, and add on...

Hi there!
I am new here and I would like to share a noise gate circuit that I have been working on.
One or two years ago I was playing around with the MXR noise gate circuit and I did a lot of trial and error modifications to it.
Then I forgot about it, until a few weeks ago I rediscovered this project and finially finished it.
It is using only cheap and standard components (and not many of them) and it could easily be added to overdrive circuits or similar.

I am really sorry, if there already...

Build the original (not Ernie Ball) MusicMan preamps for Bass and Guitar.
These preamps used the programmable current LM4250 IC and consumed a very low 44uA current. I remember a Stingray owner complaining that his bass guitar was distorting - he did not even know it had a battery in it - he had been using it for at least 3 years :!: :lol:
First up the schematics - board layout and PCB design to follow soon :wink:
The hardest part to obtain will be the 1M reverse log pot ( you could always...

I just noticed there are alot of poor buffer designs floating around out there... well, I know this is a topic that's pretty much been done to death already, since it's one of the simplest things to build, but I figured I'd share this just for the sake of having a good one out there.
Consider this a Reference buffer. :roll:
You can run it on any power supply from 9v to 18v. I wouldn't bother with less than 9v, and it would be fine to run it on a voltage higher than 18v, as long as the...

Hello guys,

It's been a little time since my last post. So i present you my last project - SMPS all tube high-gain overdrive. The name of this pedal is GTFO (a little game of words, as this project is based on the Soldano GTO Supercharger pedal).
As this project evolved, at the end was nothing like Soldano GTO (the only reassemblance is that my project is a 4 stage od too).

So here are all the documents that you will need to build this pedal. This pedal will also fit into a 1590BB box.

Best...

Here is a little circuit I just designed to emulate the presence and resonance controls in a typical tube amplifier driving a speaker cabinet.
A typical tube amplifier reacts with the loudspeaker load quite differently to a solid state amplifier - it puts extra power into the speaker at resonance and due to rising voice coil inductance at higher frequencies it puts out a progressively louder response as the frequency rises, solid state amplifiers do not do this and consequently lack the bottom...

I finally got around to designing my DIY version of the Suhr Reactive Load. I was able to simplify the circuit with off-the-shelf parts and retain nearly identical frequency characteristics. I haven't formally measured the AC impedance yet, but spice said it should be nearly the same.
AmmoCanLoad01.JPG
Sine wave sweep of the circuit produced a frequency response almost identical to the Suhr, with the major peaks and dips at the same frequencies. One thing I noted was my design had a steeper...

From my blog:

The Fulltone OCD has been an overdrive favourite for many years now. It's got a really nice tone when your amp is set right (I prefer it with Marshalls I must say). Well, I've always thought about modifiying the basic circuit (which itself is based around the old Voodoo Labs Overdrive) to give it a little more variety and use over a wider spectrum of tones.

As you can see the Super OCD has a few extra controls:

- Firstly the Bass control - it's nicked from Paul C's Timmy pedal...

Long story short, I ended up testing and measuring a good part of all odd diodes I have had accumulated over the decades of tinkering.
Some are modern, widely available, some are more rare and not produced anymore, germanium, silicon, including Schottky, silicon carbide, Zener, LEDs, IR, etc.
Here are the graphs, showing the forward voltage drop for a given current (I-V curve) for different types of diodes. Hope this is helpful to anyone. All were measured using a Peak Atlas DCA75 Pro.

The...