Welcome to the Revolution

Hi there, welcome to my blog - La Revolution Deux. It's an odd name - but I like it! Here you will find all the info on my various DIY Guitar effects builds, amplifiers and guitars. Everything from a humble Ibanez tubescreamer to the holiest KLON Overdrive.

You may also find a few effects builds that I am looking to move on - usually in exchange for other effects/gear/cash. You can always check my ebay account to see what I've got up for grabs.

Have fun, enjoy the blog - Fred Briggs :-)


Feel free to get in contact with me about anything you see on this blog or with any general questions about guitars, amplifiers and effects, I'll be happy to answer! Just click the button above to email me directly or alternately my email address is fredbriggs2007 [at] googlemail [dot] com

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Monday, 9 January 2012

Mad Professor - Sky Blue Overdrive

I love Mad Professor and BJFe pedals, almost all of them are interesting designs and useful in a *band situation*, Bjorn does a great job designing them. The Sky Blue Overdrive has been dissected by the guys at Freestompboxes and, as per, it's a pretty interesting design with a structure (after that standard gain stage) not really seen before - look at that texture control!

Taken from the Mad Professor website here is some description text;

"Mad Professor Sky Blue Overdrive (SBOD) is a very unique four knob pedal designed to overdrive already distorted amplifiers as well as provide light overdrive or soft distortion on clean sounds. Special feature on this pedal is that you can adjust the feel and dynamics with Texture and Z knobs. The Texture allows changing how and when circuit distorts as well as adjusting overall EQ.

The Z is a control that creates an adjustable load to the instrument connected to the SBOD input. With standard passive pickup loaded guitars dialing this control will adjust the upper resonant peak of the pickups. It also affects the taper of the volumecontrol on the guitar, adjusting how the tone cleans up when using the guitar volume knob."

And a youtube video of the beast in action;

Here is the schematic for you to view;

The texture control has been modified by mictester - it works exactly the same as the original control but doesn't require a dual taper pot. You can also up the texture pot to 5kB for a more useful range (again as suggested by mictester).

Here is a great vero provided by Method;

Finally to view all the gossip and chat around the Sky Blue Overdrive check out the freestomp thread; http://freestompboxes.org/viewtopic.php?f=7&t=9162&start=40


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