dirtboxlayouts
Exar OD-02 Overdrive
Cool looking soft clipping overdrive using a discrete op amp setup. Schematic is avaiable HERE.
Exar MT-1 Metal
Might be something for the HM-2 fans? The gyrator frequiencies and Q’s looks promising… Schematic is avaiable HERE.
Exar HR-03 Hammer
An old polish distortion which is based on Ibanez Trash Metal. Which is basically a buffered and boosted Rat circuit with an additional fixed gyrator EQ stage after the distortion circuit. Schematic is avaiable HERE.
Pigtronix Bass Fat Drive
Schematic is avaiable HERE. Very close to the normal Fat Drive, just four cap value changes.