Guzik 8021 Programmable Filter PCB Board Assy 301920 1.5-8MHz HDD Servo

Guzik 8021 Programmable Filter PCB Board Assy 301920 1.5-8MHz HDD Servo

The Guzik 8021 is a programmable filter PCB assembly used in Guzik disk drive test and servo analysis equipment. Carrying assembly number 301920, this board provides selectable or programmable analog filtering across the 1.5–8 MHz frequency range — a band characteristic of the servo and data channel signals read from hard disk platters during test and alignment procedures. The filter board interfaces with the host instrument via multi-pin header connectors and is designed to be installed as an internal subassembly within Guzik disk analysis systems.

Specifications & What's Included

• Manufacturer: Guzik
• Model: 8021
• Assembly Number (MPN): 301920
• Type: Programmable Filter PCB Assembly
• Frequency Range: 1.5–8 MHz (silkscreened on board)
• Main IC: Motorola LF444CN — quad JFET-input operational amplifier (DIP-14)
• Additional components: blue multi-turn trim potentiometers (for filter tuning), film and ceramic capacitors, metal film resistors
• Connectors: multi-pin edge/header connectors at both ends of the board
• PCB copyright date: 1991
• Form factor: bare PCB module (card/board subassembly)
• Sold as: bare PCB only — no enclosure, no chassis hardware

Applications

Guzik Technical Enterprises is a well-known manufacturer of disk drive test and certification equipment, producing instruments used by hard disk drive manufacturers and MRO facilities for media certification, servo analysis, and read/write channel testing. The 8021 programmable filter board is a subassembly for Guzik disk test systems, where programmable analog filtering is used to select the appropriate bandwidth for the servo or data channel under evaluation — matching the filter cutoff to disk geometry, rotation speed, and track density. The LF444CN quad JFET op-amp at the core of this board is well-suited to low-noise analog signal conditioning at these frequencies. Equipment of this type dates from the early-to-mid 1990s era of HDD manufacturing test, when dedicated analog filter subassemblies were a standard part of disk certification instrument design. This board would typically be sought as a replacement or spare for a Guzik disk analyzer system.