Terminal Device is a highly modified Shin-Ei Companion Fuzz, based on the Earthquaker Devices Terminal Fuzz. The unique buzzy sound of the original pedal was awesome, but the modifications make this design go three steps further: the addition of a pot at input that regulates the amount of signal being fed to the circuit, a controllable tone stack, and an output gain stage after the volume control to get the fuzz above unity volume.
Building Docs coming soon. Stay tuned!
For further analysis on this circuit take a look at this thread on Free Stomp Boxes Forum.