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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.

2A-66-42
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  • Can you use a 74LS266? XNOR instead? – Aaron Dec 31 '20 at 18:47
  • 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. – 2A-66-42 Jan 01 '21 at 01:00
  • *"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. – Aaron Jan 01 '21 at 01:04
  • I don't understand how it would solve it since half of the output would still be inverting. – 2A-66-42 Jan 01 '21 at 08:58

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