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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 :-)

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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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Tuesday, 28 February 2012

Fred Briggs - E11even - Marshallesque Booster/Overdrive


Here's the schematic:


And here's the last in my series of Fender / Vox / Marshall themed boosters/overdrives - The "E11even" (Spinal Tap reference intentional). It's designed for those classic Marshall overdrive tones, plexi / jtm45 sort of stuff. It's based around the old mosfet booster design I love with a few tweaks. The bias control is essentailly a saturation control for those diodes, setting it high gives you more headroom and a smoother more spanky (hehe) overdrive, a lower setting gives a more gritty tone. The Body control allows you to alter the bass content and overall frequency gain structure of the circuit. When the body is at 470k you've got the classic Marshall mid/high boost filter (almost, with that 1M resistor to ground you don't quite get the same level of low end roll off but it works with this setup). One suggestion I have for a mod is placing the saturation control over one diode only so that you can dial in some really interesting (and extreme!) asymmetrical clipping structures...



For the protection diode you can use a 12v zener or just a red LED. I use a 470kB (linear taper) pot for the Body control but some may like the taper of a log pot here - it's up to you...

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