On Sat, 25 Jun 2005 21:15:05 -0400, Al A.
wrote:

On Sat, 25 Jun 2005 14:14:35 +0100, wrote:

A bit off topic but could be useful for some measurement problems.

Home brew, remote readout, lever type dial gauge
+-0.0025" & +-0.025" Full scale
Also usable with linear inductive sensors.

Details in Drop Box :-

dial gauge.txt
Circuit diagram.jpg
Synchro Sensor.jpg
Clocking Workpiece.jpg


Jim

Jim,
Nice job!
I love the concept.

Any idea on sources for the synchro transmitter? Where the ones you
used 400Hz units? I have several, but they are a much larger and are
120V 400Hz units.

Thanks for posting this stuff!

AL A.


The unit I used is a 2608CX4 rated as a 26v 400Hz control
transmitter rescued from old aircraft bits. Pretty well any surplus
outfit stocking bits of aircraft or military instruments should have
something suitable. Where are you? Perhaps someone with local
knowledge can provide a few pointers.

The circuit is not fussy on the type of synchro - the 2608CX4
is about the most demanding type. This 26v 400Hz transmitter loads the
555 more heavily than practically any other type. Synchro receivers,
resolvers, control transformers, 60 or 400Hz, 26v or 120v should all
be OK. The changes needed should be limited to choice of damping R and
overall gain.

One other variable is the operating frequency - 1KHz was
chosen as higher than 400Hz to reduce the load on the 555 but still
low enough for the secondary waveform to be a pretty clean squarewave.
1KHz should still be OK for 60Hz synchros. It could be increased if
the synchro you find loads the 555 too heavily.

Jim