Re: GS indicator circuit-Jim Weir?

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.


.

Relevant Pages

  • Re: GS indicator circuit-Jim Weir?
    ... What does the rotary encoder do? ... 10 or 20 step voltage divider as a reference. ... the comparators compare the voltage used to move the needle and light ... How hard would it be to make a GS indicator, with say LEDs ...
    (rec.aviation.homebuilt)
  • Re: LED voltage bar graph
    ... LEDs would be plenty. ... Any suggestions for a discrete version of the LED voltage bar graph? ... if just the Nth LED is lit, if this simplifies the circuit at all. ... If you have a voltage reference, you can easily scale voltages so that a couple of quad comparators, along with 100k trimmers can be used to do something like this. ...
    (sci.electronics.basics)
  • Re: transmitter...default user
    ... >comparators you speak of i have searched the net but cant seem to ... You want a relay well ... comparing voltage levels. ... when the output pin is low. ...
    (sci.electronics.misc)
  • Re: Cant get enough current for 1W Luexon LED even without resistor
    ... Then I tried without the resistor but ... the LED I have to raise the voltage to about 11V and of course I ... Seems like my battery has too much internal resistance. ... voltage with LEDs, although your calculations are of course all correct. ...
    (sci.electronics.repair)
  • Re: Another odd circuit request
    ... >> be pumped out to a motor whenever any of the LEDs are active. ... > charge in at a fixed rate, the voltage will increase at a fixed rate. ... > 1) A way to accurately add and drain charge from a capacitor. ... > comparator with a resistor to limit the current. ...
    (sci.electronics.basics)