Got a request for an active DI, which coincided with a project I'm working on, so it seemed like a good idea. This one's designed by Samuel Groner and modified by Jack Orman. The schematic came from his blog and can be found here, along with some other info about the circuit.
This is a library of perfboard and single-sided PCB effect layouts for guitar and bass. I'm not an electrical engineer by any stretch of the imagination, just a DIY'er who likes drawing layouts. It is meant for the hobbyist (so commercial use of any of these layout is not allowed without permission) and as a way to give back to the online DIY community.