Air core meter

[peter paul fenske]

At 12:52 PM 8/16/96 EST, you wrote:
>
>
>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.
>
>
Greetings:
Not knowing who is GM in Aussi, in North America, most gm cars use
a air core meter as a basis of their tachometer. If you look at
most vehicles one where the tach remains at a certain rpm on shutdown
prob uses a aircore meter.

If you check the National Semi you will find a LM1819 which is the
chip GM uses to drive their tach.

GL:peter