80552, Air core meter

Stuart Baly S.Baly at BoM.gov.au
Fri Aug 16 02:52:53 GMT 1996



Can anyone comment on their experiences with using an 80552 as the basis 
of an ECU? Does anyone know where I can get my hands on an 80552 based SBC, 
preferably with external EPROM and RAM and access to the high speed 
outputs? I checked out HiTech's offering, and Micro Control and 
Diagnostics's page on the Web, and was wondering if there were more.
I've tried routing my own, and have nearly finished it, but being 
a single sided board, it's an absolute dog's breakfast of jumper wires, and 
I wouldn't trust the end product to get me to the pub, let alone be 
regarded as reliable transport.

In an old Philips 8051 databook I have, it describes a meter movement 
called an air core meter - two coils are fixed at right angles to each 
other, and a permanent magnet moves the needle. To move the needle to a 
desired angle, the coil currents are set so that one coil current is 
proportional to the sine of the required angle, and the other is the 
cosine. The big question is, are there any cars available in Australia (or 
more to the point, in Australian wrecking yards) which use this movement? 
It looks like a fun thing to play with.





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