Should be easy enough using op-amp comparators with resistors setting up
a 10 or 20 step voltage divider as a reference. For example, if the
voltage swing that drives an analog meter goes from 0 volts for the
needle at its full down position (high of GS) to 5 volts at its upper
most swing (low of GS), the comparators compare the voltage used to move
the needle and light a corresponding LED (at 2.5 volts, or half-scale,
the green LED would be lit)...Terra produced just such a radio back in
the 80s...I think it was called the Tri-Nav C...

Scott


Fonz wrote:

This question is mainly aimed at Jim Weir, but others are more than welcome
to give their 2c.
With the aero-lectrics column in kitplanes, a GS tester has just been
completed.
My question. How hard would it be to make a GS indicator, with say LEDs
instead of lines and needles. For example, when going down the glideslide,
needles centred, you get a Green led in the centre, diverge and get yellow,
really off and get red, the universal warning. Rotary encoder with 7
segment leds for OBS. How hard would this project be? (considering the
grand scale of the test unit just completed). Obviously not for Primary
use, but as a tester for radios, and possibly a back-up unit.
Thanks.
Just a thought.
Rob
Australia.