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
| Capacitors | ||
| Nominal | Type | Quantity |
| 47nF | Film | 4 |
| 47uF | Electrolytic | 1 |
| 100uF | Electrolytic | 1 |
| 220pF | Ceramic | 2 |
| 100pF | Ceramic | 1 |
| Resistors | ||
| Nominal | Quantity | |
| 1M | 2 | |
| 22K | 2 | |
| 470K | 1 | |
| 100K | 2 | |
| 430R | 1 | |
| 4.7K | 1 | |
| Diodes | ||
| Type | Quantity | |
| 4001 | 1 | |
| Operational Amplifiers | ||
| Type | Quantity | |
| OP275 | 1 | |
| Potentiometers | ||
| Type | Quantity | |
| A50K | 2 | |
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
