Jonathan Hancock wrote: > Thanks Jon. You're right - the waveform is from the raw photosensor outputs. > > Would it be posible for you to provide a circuit diagram using the LM193 > please? I have tried an op-amp (Max942) as I have a few kicking around. > I connected A+ to one i/p and A- to the other following a diagram that I > found by a University student working on a Puma. It doesn't work! Oh, so you have differential outputs? That is much better, as it compensates for fading of the LED.
OK, the LM193 is really easy to connect. Ground is pin 4, +5 V (or whatever your power supply is, up to 15 V) is pin 8. For the first comparator, the + input is pin 3, the - input is pin 2. The output is pin 1. (same pinout as a dual op-amp, how convenient!) Connect A+ to pin 3, A- to pin 2. Connect a 1 K Ohm resistor from +5 V to the output, as they are open-collector, and need a pull-up. This really ought to work if the A+ and A- signals are crossing some intermediate voltage. For the 2nd comparator, in+ is pin 5, in- is pin 6, out is pin 7. Jon ------------------------------------------------------------------------- This SF.Net email is sponsored by the Moblin Your Move Developer's challenge Build the coolest Linux based applications with Moblin SDK & win great prizes Grand prize is a trip for two to an Open Source event anywhere in the world http://moblin-contest.org/redirect.php?banner_id=100&url=/ _______________________________________________ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
