Black Cat OD-1

The Black Cat OD-1 (also known as Freddie Fuzz) is an original design by Fred, based on the unique properties of the OP275, a dual operational amplifier IC manufactured by Analog Devices. The OP275 is a high-quality operational amplifier that gives a distinctive linear output signal shape. The Black Cat OD-1 can produce anything from a clean, slightly crunchy, to a fully saturated distortion. The uniqueness of the amplifier lies in the fact that it is extremely sensitive to the guitar; it responds to the player’s pick attack, and, like a good Fuzz Face, it cleans up the sound well when you turn down the volume on your guitar. The Black Cat OD-1 has been used by Scott Henderson, Steve Lukather, Beck, Lyle Workman, Kyle Cook (Matchbox Twenty) and many others.

Black Cat OD-1 Circuit Board Schematic

List of components for the board

Other components

• 3PDT switch for true bypass
• 6.3 mm jack connectors for input/output x2
• DC 9 V power connector, center negative
• Hammond 1590G type enclosure
• LED 9/12V