The Calypso CMOS Drive is a pedal based on the Catalinbread Supercharged Overdrive (SCOD), which was first released in 2004. The SCOD used CMOS inverters in an amp-like topology to achieve tones reminiscent of Marshall and Orange amplifiers. Catalinbread, known for tweaking circuits, made various editions of the SCOD over the years, with changes to the layout and circuitry.

The Calypso CMOS Drive is a faithful reproduction of the most recent version of the SCOD before it was discontinued. Aion FX traced the circuit to verify the original trace and document any circuit changes that may have been made. The SCOD used the CD4007 CMOS chip, which provided direct access to complementary MOSFET pairs on the chip. While the SCOD’s MOSFET pairs were wired as inverters, similar to the CD4049/CD4069 used in other pedals like the Way Huge Red Llama or EHX Hot Tubes, it still had a unique character.

One of the standout features of the SCOD and Calypso is the amp-inspired global feedback that serves as the tone control. This feedback circuitry gives the pedal a voicing similar to Marshall “Plexi” or Orange amps. The Calypso retains this unique characteristic and fills a sonic space not covered by other amp-drive pedals in Catalinbread’s lineup.

The only modification made to the SCOD in the creation of the Calypso is an increase in power filtering. This ensures a cleaner and more stable power supply for the pedal. Overall, the Calypso CMOS Drive offers the same unique and amp-like tones as the SCOD, making it a versatile choice for guitarists seeking Marshall or Orange-inspired overdrive sounds.

Summary created by AI from the original source.