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I need to make a one-shot multivibrator with a OA, since in the main design, one OA is available form a package with 4 (single supply).

Triggering can be either POS or NEG since I can adapt the circuit before. What I really need is OUT pulse to be active low.

What I simulated is this schematic, but the output pulse is active high. Of course I can invert it with a transistor, but I wonder if it can be done with a single OA :)

enter image description here enter image description here

Thanks for any ideas :)

PS. Currently I use a NAND one-shot multivibrator design that I try to replace with a OA.

yo3hcv
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  • I would try turning the diode around the other way and changing the triggering to positive. Try that and let us know the results. On second thought, you might not need to turn the diode around. I'm going to have to set it up in ltspice and try it myself. – GodJihyo Dec 29 '21 at 17:47
  • I don't have the TS27X model and I can't get this to sim with any other opamp I've tried. Did that model come with LTSpice? – GodJihyo Dec 29 '21 at 18:14
  • Just use any OA from library that works with single supply, 15V, rail to rail – yo3hcv Dec 29 '21 at 18:18
  • I've tried several, all I get is the original pulses inverted, no latching action. – GodJihyo Dec 29 '21 at 18:20

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