Project Logs

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• Smiths Remote Interface Unit from British helicopter

  Don Straney • 3 days ago • 0 comments

  Newest one I've opened so far - here's a Remote Interface Unit (aircraft version of an I/O expander) from 2004:

  https://www.eevblog.com/forum/projects/reverse-engineering-misc-avionics-(part-3-raytheon-eas-diehl)/msg5467831/#msg5467831
  

• Mystery RF boards from Cubic Defense

  Don Straney • 04/21/2024 at 02:13 • 0 comments

  I traced the schematics of some mystery RF boards from the early 80's, and looked at hybrid circuits inside some metal cans:

  https://www.eevblog.com/forum/rf-microwave/interesting-unusual-rfmicrowave-boards/msg5460263/#msg5460263

• Frequency multiplier from 60's X-band radar

  Don Straney • 03/25/2024 at 20:38 • 0 comments

  Posted a quick teardown & analysis of a frequency multiplier from an AN/APQ-120 radar: https://www.eevblog.com/forum/rf-microwave/interesting-unusual-rfmicrowave-boards/msg5412884/#msg5412884

  Includes an impressive number of trimmer capacitors, and an old microwave diode
  

• Fire control computer teardown

  Don Straney • 02/18/2024 at 02:53 • 1 comment

  Added a partial reverse-engineering analysis of a late-70's fire control computer from a tank, inc. notes on radiation-hardening electronics.  More descriptions of digital logic & power supply to come.

  https://www.eevblog.com/forum/projects/reverse-engineering-a-late-70s-fire-control-computer-from-an-m1-tank/

• Mystery Interstate Electronics Corp. boards

  Don Straney • 02/08/2024 at 04:46 • 0 comments

  68000 CPU on a mid-90's board that may be from specialized navigation/training(?) equipment; a giant ASIC contains many mysteries.

  https://www.flickr.com/photos/147639706@N02/albums/72177720314646603/

• Honeywell NZ-920 aircraft navigation computer

  Don Straney • 01/24/2024 at 18:26 • 0 comments

  Finally got around to finishing a writeup about the NZ-920 navigation computer I got as scrap a while back.  Unfortunately wasn't able to do any real circuit tracing here due to a combination of densely-packed multi-layer boards and conformal coating, but figured out some things about it just from looking, although mysteries remain.

  https://www.eevblog.com/forum/projects/avionics-reverse-engineering-honeywellsperry-nz-920-navigation-computer/

• Rocketdyne I/O board

  Don Straney • 01/15/2024 at 05:52 • 0 comments

  Final installment of the Rocketdyne board analysis: this one's much clearer about what it does and how it works, despite a few minor mysteries.

  https://www.eevblog.com/forum/projects/avionics-teardown-looking-at-some-mystery-rocketdyne-boards/msg5279293/#msg5279293

• Mystery Martin-Marietta board

  Don Straney • 01/12/2024 at 16:55 • 0 comments

  Added photos and a high-level speculative analysis (not the normal detailed circuit-level analysis) about a mystery Martin-Marietta digital board.  It may be a string of shift registers for serializing/de-serializing data as part of the telemetry or radio-control system on a Titan rocket....or it may not.  It depends on a government contract number that I don't have info on.
  

• Mystery IBM FSD cards/gold hybrid modules

  Don Straney • 01/09/2024 at 23:59 • 0 comments

  Posted analysis of some old 70's mystery computer(?) cards from IBM Federal Systems Division, with nice gold hybrid modules, and an attempt to interpret the comparator(?) circuitry inside each hybrid:

  https://www.eevblog.com/forum/projects/reverse-engineering-old-aerospacemilitary-computer-peripheral-boards/

  I also have extra copies from the same batch for sale.

• Rocket engine controller boards

  Don Straney • 01/02/2024 at 22:58 • 0 comments

  Added some analysis (2 out of 3 boards) for some Rocketdyne PCBs I picked up from an industrial surplus seller - really special stuff here, with lots of gold, hybrid-circuit modules, and heavy-duty construction.

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