Paul,

I have been experimenting with signal condition for the 2nd gen CAS sensor.

Do you know how much voltage it produces?

It seems to be producing a AC signal at .05 volts at 500 rpm CAS shaft speed.

I am trying to increase the voltage with the LM1815 chip but can’t get it to work.

Does the voltage go up when you turn it faster?

Does the CAS turn 2 X Eshaft speed?

Thanks for any help.

Joe Berki


Yes it does. That LM1815 handles that very well.

You must however use a 5 volt regulator LM78L05 to power the
LM1814 chip. It is designed to output a 5 volt 100 usec wide pulse
to a computer.


The second gen CAS turns at half E-shaft speed. That is why
there are two tits on the top part of the rotor shaft. That way you get
one signal pulse per revolution of the e-shaft at 22 degrees BTDC
rotor 1.

You will need two LM1815's. One for the upper level and one for the lower
level if you need that.

If you are using it for something other than a computer and you need
a higher voltage a good chip to take in 5 volts and put out
12 is a ULN2003. It will work up to 30 volts. It is easy to use and will tolerate a
lot of abuse. You get six Open Collector outputs.


Paul Lamar

 The Rotary Engine News Letter. Powered by Linux.
 ACRE NL web site. http://www.rotaryeng.net
 You Tube http://tinyurl.com/beqqxas
 Copyright 1998-2014 All world wide rights reserved.