Miscellaneous Schematics

Active Signal Splitter - thanks to Dave H.
BOSS Super Over Drive - The capacitors marked with red values were wrong (ten times bigger). Now thanks to Santiago Alvarez, who sent me the correct values, they're OK.
Turbo Rat. The LED's in the clipping section are red. A non-turbo RAT (that sounds better) uses small signal silicon diodes instead of LEDs for clipping. The transistor driving the indicator LED is a darlington.
Pickup Switching System - This arrangement will give you every usable combination in a two humbucker guitar. You can chose Neck/Both/Bridge, series/parallel connection and humbucking/single coil operation (both humbucker, both single or neck as humbucker and bridge as single). Every two pickup combination is hum cancelling, except when you use the neck as humbucker and the bridge as single coil.
PSPICE model for the 12AX7 - this model takes in account the "bending" of the curves for low plate voltages (you can use it to simulate starved plate preamps). Based on the model and optimization techniques presented in http://www.winternet.com/~biro/ by MITHAT F. KONAR (you can find models for the 12AT7 and 12AU7 on this link). I matched the model to the data on a Phillips receiving tubes manual.

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