I have a ULN2803 that drives a higher current H-Bridge but the issue is the ULN2803 is inverting the output. I was thinking of switching the ULN2803 off until the micro-controller is ready to take over but I'm not sure how to go about it.

For reference here is the circuit I'm building: enter image description here

I was thinking about putting a transistor on the GND pin of the ULN2803 but could not get it to work.

  • \$\begingroup\$ Can you use a 74LS266? XNOR instead? \$\endgroup\$ – Aaron Dec 31 '20 at 18:47
  • \$\begingroup\$ Unfortunately I don't have any 74266 at hand. Nevertheless even if I used a XNOR TTL there would still be half of the outputs high on the ULN2803. \$\endgroup\$ – 2A-66-42 Jan 1 at 1:00
  • \$\begingroup\$ "the issue is the ULN2803 is inverting the output" Based on this, inverting the input would solve it. If you have more conditions you need satisfied please update the question. \$\endgroup\$ – Aaron Jan 1 at 1:04
  • \$\begingroup\$ I don't understand how it would solve it since half of the output would still be inverting. \$\endgroup\$ – 2A-66-42 Jan 1 at 8:58

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