Is there any such thing of a 28 volt Logic Or Gate?

Question

Or do you have to use resistors to get down to the 5 volt Or Gates that i have been seeing?

Answer 1

there used to be a 12v logic series, but they are long gone.

no, no such thing.

But you can make it with 2 diodes and a pull down resistor. Connect the diodes to each signal, tie the other ends (cathode) together, run a 27k resistor from there to ground and you are done.

edit, had the resistor wrong, fixed.

more details, see

http://en.wikipedia.org/wiki/Diode_logic

Answer 2

There are relay drivers that have TTL inputs.   The outputs of these can be wire-or'd together for increased current.

http://pdf1.alldatasheet.com/datasheet-p...

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