Using inverters as buffers

Discussion in 'General Electronics Chat' started by mongause, Jun 19, 2013.

  1. mongause

    Thread Starter New Member

    Jun 9, 2013
    In testing my parallel port opto-islolation board, I discovered that it only drops to around 2.6v for a 0. I invert each signal to energize the reverse phase of each stepper winding but that signal is a solid 0 and 5 volts, after coming through the not gate.
    I'm thinking of using a second hex inverter to double invert the first one's signal back to original to get a crisply delieneated digital output, for both phases.
    How well will this method protect my computer's parallel port?
  2. Ron H

    AAC Fanatic!

    Apr 14, 2005
    You need to post your schematic, indicating where the problem area is.