Heathkit ET-3200 Digital Design Experimenter Zenith Educational Systems

Heathkit ET-3200 Digital Design Experimenter Zenith Educational Systems

The Heathkit ET-3200 is a self-contained digital logic trainer produced by Heathkit under the Zenith Educational Systems brand. It provides an all-in-one benchtop platform for learning and experimenting with digital logic circuits, combining a built-in regulated power supply, a dual-frequency clock, logic input switches, logic output indicators, and an integrated breadboard — everything needed to build and test digital circuits without additional bench equipment.

Specifications & What's Included

• Manufacturer: Heathkit / Zenith Educational Systems
• Model: ET-3200
• Input Power: 120V AC, 50/60Hz, 100mA
• Fuse: 250V, 3/16 AMP
• Color: White
• Form Factor: Benchtop / Desktop
• Power Supply Outputs: +12V, GND, -12V, +5V (all brought out to front-panel binding posts)
• Line Source: GND binding post for external reference
• Clock Generator: Two selectable frequencies — 1Hz and 100kHz, with CLK, GND, and CTR outputs on front panel
• Logic Indicators: 4 LED indicators (L1, L2, L3, L4) for monitoring logic states
• Logic Switches: 2 banks (A and B) for manual logic-level inputs
• Data Switches: 4 switches (SW1, SW2, SW3, SW4)
• Breadboard Area: Integrated solderless breadboard strip along lower front panel for circuit prototyping
• IC sockets: Several DIP IC sockets visible on front panel for plug-in component testing
• Power switch and power indicator LED on front panel
• Unit only — no manual or accessories included

Applications

The Heathkit ET-3200 was designed for electronics education in the 1980s, during the era when Heathkit partnered with Zenith to produce a full line of educational laboratory instruments for vocational, community college, and university electronics programs. Trainers like the ET-3200 were used in classroom and lab settings to teach students fundamental digital logic concepts: Boolean algebra, gates (AND, OR, NAND, NOR, XOR), flip-flops, counters, and combinational logic design. The built-in clock, switches, and indicators meant students could observe circuit behavior in real time without needing a separate function generator or logic probe. Today, the ET-3200 is sought by vintage electronics enthusiasts, educators running retro electronics programs, and hobbyists interested in classic hands-on digital logic experimentation from the kit-building era.