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A trip back in time in avionics

I had acquired a couple of Shadin ADC200 airdata computers, of unknown origin.

So I took one of them apart. The internal are a trip back in time into the early history of microprocessors, and a fine example of “spare bedroom” manufacturing

The processor is an 8032

The second PCB has various analog bits

Various date codes on components suggest it was made in 1995.

Interesting how they wrapped up the differential pressure transducer – presumably to protect it from excessively rapid temperature changes

Even for the era, there is an astonishing amount of hardware in there!

The ever popular EDM700 (a similarly priced box) is the same inside…

Administrator
Shoreham EGKA, United Kingdom

Peter wrote:

Interesting how they wrapped up the differential pressure transducer – presumably to protect it from excessively rapid temperature changes

On most equipment, it is isolation for the heater. Typically no temperature correction is used, but an heater to make it temperature indendent. This is also true for altitude encoders for example, sometimes people complain on temperature of avionics, while is some cases, with some older GPS receivers, Air Data Computers, or Aspen for example.

JP-Avionics
EHMZ
2 Posts
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