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• Mystery Honeywell Aerospace boards

  Don Straney • 05/11/2026 at 19:58 • 0 comments

  Here's some boards of unknown function from the mid-90's: https://www.eevblog.com/forum/projects/avionics-teardown-honeywell-aerospace-mystery-boards/

  I couldn't reverse-engineer a full schematic, but looking at all the part numbers lets us at least learn some things about them (plus they look really nice).

• Marconi avionics analog input board

  Don Straney • 03/09/2026 at 00:26 • 0 comments

  Here's an analog data acquisition board from 1982 that I suspect is from an aircraft Heads-Up Display: https://www.eevblog.com/forum/projects/reverse-engineering-misc-avionics-(part-3-raytheon-eas-diehl)/msg6207329/#msg6207329

  ...and a closer look at the ADC hybrid module it's built around: https://www.eevblog.com/forum/projects/de-capping-circuit-analysis-of-hybrid-modules/msg6207351/#msg6207351

• Hughes Aircraft digital logic board from the 70's

  Don Straney • 01/26/2026 at 03:27 • 0 comments

  Here's a strange one, with reversed IC pinouts and other strangeness - sure is nice to look at though: https://www.eevblog.com/forum/projects/reverse-engineering-two-70s-military-digital-logic-boards/msg6171713/#msg6171713

• Mystery comms & logic board

  Don Straney • 12/28/2025 at 00:12 • 0 comments

  This large assembly only contains 3 MIL-STD-1553 serial channels, plus some counters.  Surprising how much board space this used to take up!  https://www.eevblog.com/forum/projects/avionics-teardown-engine-controller-boards/msg6143931/#msg6143931

• IBM Federal Systems Division Oscillator/Audio Module

  Don Straney • 11/01/2025 at 17:14 • 0 comments

  Here's an interesting module that generates an (audio?) waveform from a ROM, at a programmable frequency, using some fun symmetry tricks to reduce the memory needed: https://www.eevblog.com/forum/projects/reverse-engineering-two-70s-military-digital-logic-boards/

• Late-60's telemetry unit teardown

  Don Straney • 08/20/2025 at 04:53 • 0 comments

  Lots of interesting things to see in this airborne telemetry unit from Hughes Aircraft: early ICs in gold flatpacks, tiny ceramic PCBs, and tightly-packed 3D RF circuitry.

  https://www.eevblog.com/forum/projects/avionics-reverse-engineering-60s-hughes-telemetry-unit/
  

• Mystery flex-PCB card

  Don Straney • 08/03/2025 at 00:48 • 0 comments

  Interesting construction here, with an extra-thin assembly based on a flexible PCB and a thin metal backing: https://www.eevblog.com/forum/projects/reverse-engineering-misc-avionics-(part-3-raytheon-eas-diehl)/msg5998709/#msg5998709

• Aircraft engine controller boards

  Don Straney • 07/06/2025 at 19:23 • 0 comments

  Here's a couple engine control computer boards from a commercial aircraft: https://www.eevblog.com/forum/projects/avionics-teardown-engine-controller-boards/

• Naval analog video boards (#2)

  Don Straney • 06/08/2025 at 02:04 • 0 comments

  Here's a "deflection pre-amplifier", with a lot of textbook discrete-transistor amplifiers, plus some interesting twists on current-source biasing: https://www.eevblog.com/forum/projects/reverse-engineering-some-navy-(submarine)-video-boards/msg5940508/#msg5940508

  
  

• Naval analog video boards

  Don Straney • 06/06/2025 at 21:53 • 0 comments

  Looking at the first of two video amplifiers, from some kind of 80's marine electronics, possibly from a submarine combat data system: https://www.eevblog.com/forum/projects/reverse-engineering-some-navy-(submarine)-video-boards/

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