>> Hi! Try a diode with a lower forward voltage drop like a Schottky or Germanium diode.
>> It must be able to carry 1A current though. A Si diode will drop 0.7V which may be
>> pushing your TIL311’s too low.
I tried all kinds of diodes, including a germanium. None seemed to supply enough power (the displays showed "-"). The polarity was fine. A wire jumper did the trick, and the digits aren't too bright or "hot". Both 5v regulators on the card remain cool when it is in use. I will probably pull the TIL311's anyway, after all the check-out. They are quite visible when the card is in an extender, but what good will they be when the card is down in the card cage?