Ampeg A3 Overdrive

 
From UnofficialAmpeg.com: During MTI's ownership of Ampeg, everything was being built in Japan. Ampeg's most extensive line of pedals is no exception. In production during 1982 and 1983, the "A" series effects were housed in black steel boxes with brightly colored graphics in pinks, oranges, blues, yellows, etc., and included nine pedals and a "systems box".

From what i can tell from the prices i've seen - these are very collectible pedals. Might be a nice subject for building your own. The semiconductors are not mentioned (other than 4558 as opamp) on the schematic, but as the transistors are used as buffers, you should be fine with 2N3904, 2N5088 or similar. The clipper diodes are silicon, so 1N4148 should be very close to the original.

Monkee Music Satan Distortion

Been waiting a long time to post this one up. Yup. It is 1:1 with Rocktek DIR-01 Distortion. The schematic i found was missing a couple of values, so instead of guessing i got myself an original and checked them. My original just happens to be this beautiful japanese plastic thing. It doesn't quite reach the unity level, but there's one resistor determining the overall level. I marked that with an asterisk on the layout with a note, so you can swap it for something like 10K. This one is definitely nice platform for trying on some mods. Schematic is up at FSB.

While checking for additional info, i ran into this perfect demo video of later Rocktek unit. Priceless. Just Priceless.

General Guitar Gadgets D-Verb

A nice simple reverb project that a few people have asked for, with this layout based around the BTDR-2H brick.  The short description from the GGG website:

This is a great sounding digital reverb project.  Based on the Belton Digital Reverb Brick.
This really is an excellent reverb and is also the base of some of the reverb units being built by Hermida Engineering, used by many big name guitarists.

I've left the original layout up, but this is one row smaller so thought it worth adding for anyone who wants to keep the size down:

EHX Axis / Guild Foxey Lady 2-knob

The circuit is exactly the same in Electro Harmonix Axis fuzz and Guild's 2-knobbed Foxey Lady. 2N5133 may and will be very hard and expensive to source, so i'd suggest trying out any low hFE NPN Si transistors. Or go wild and try on anything you like. The cap values of 50µ and 4µ is another issue. Go with 47µ and 4.7µ. Should be close enough. I've added polarity protection and pulldown resistor, but you could omit them and save a column in order to make it verbatim with the original.

Yerasov Gamma DS-1 Distortion

Old Yerasov Gamma series distortion. Box totally looks like a Boss rip off, but the insides are not.