hmpf. Handmade Seisakujo-san Overview A self-made product based on the circuit diagram of the FULLTONE OCD (OBSESSIVE COMPULSIVE DRIVE). There is a switch inside that allows you to switch between Rev1.1 (initial model) / 1.2 / 1.3. I can't write about the characteristics of each version here, so please search and investigate. An output buffer was added to lower the output impedance. However, the buffer cannot be turned on by itself. Although there are subtle differences in tone, the OCD in any version has a powerful sound and produces a lively sound suitable for rock music. Specifications Power: Center-negative 9-18V adapter (battery not included) (From the creator's description) [Operation confirmed]