[images of custom shop Super Duper 2 in 1 pedals - how cool is the butterfly?]
Here's a project I'm adding just because I get a lot of requests for the schematic - it's the Zvex Super-Duper-2-in-1. Basically two cascaded Super Hard on circuits with a master volume control at the end.
Here's an internal gutshot of the Super Duper [Note the extra transistors for Millenium bypass switching/polarity protection]:
Here's the description from the Zvex website:
"The SUPER-DUPER 2-IN-1 (TM) has two of my infamous but rather delightful Super Hard-On(TM) pedals in one small box, with two switches and LED indicators. HEY! I responded to your multitude of complaints that I don't put in LED's! Also, in this SUPER-DUPER 2-IN-1 (TM) (gosh I love saying that) is a Master volume control that lets you use it as an overdrive/distortion with any output volume. My my! How conventional, you say! Well, suffice to say, if it weren't there, you'd go deaf with both of those channels cranked up. This pedal is dangerously loud. Don't do what I did, and lean over in front of your speaker cabinet while turning it up. Ouch. Dang.
This channel is a conventional Super Hard-On (TM), which I will henceforth refer to as the SHO, in order to reduce potential offense to young ears and sensitive persons. Its gain control is on the far right, and it's LED is yellow. If you are familiar with the SHO, you'll know that it's a very sparkly sounding high input-impedance preamp with incredible headroom, wide-ranging gain (unity to 60 X), and a maximum volume that will knock out your fillings. Channel one has no Master Volume control, but it's cascaded into Channel 2, which does...
CHANNEL 2 AND THE MASTER VOLUME:
This channel has the very same circuit as Channel 1, but the bleeder resistor on the output has been replaced with a Master Volume control, which allows the user to turn down the output volume even if the gain is set quite high. The knob on the left is the gain, and the middle knob is the Master Volume, and the LED is red. When both channels are on, or if only Channel 2 is on, the Master Volume is active. If you leave the Master wide open, you have two identical SHO pedals in one box, which are cascaded."
Here's the ProGuitarShop demo video so you can see the Super Duper in action:
And here's a schematic for you:
Here's the freestompboxes.org forum topic for reference: http://freestompboxes.org/viewtopic.php?f=7&t=696