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flip-flop circuit

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yalect:
Hi,
I would like to ask you if I can build flip-flop led ciruit using op-amp Lm358 and what it's Working conditions?
Thank you

GerryR:
I am reasonably sure that if you google "op-amp flip-flop," you will only find about a million, + or -, versions of op-amp flip-flops!  As an example:  https://www.radiolocman.com/shem/schematics.html?di=463517.  Adapting the 358 should be pretty straight forward.  :)

yalect:
thank you for your reply
but Features of LM358 allow to make flip-flop circuit?

David Hess:
Yes, an LM358 will work fine in a flip-flop circuit.

Zero999:
Coincidentally, I've just been working on a schematic which requires an op-amp bistable. I chose the comparator, rather than an IC or discrete bistable, because the trigger voltage can be set fairly accurately.

Here's the circuit, but using the LM358 and changed so I can post it here. The original design uses an LM393 comparator and is part of a bigger design. If Schottky diodes are used, the forward voltage can be ignored for most applications and the bistable will fire when the inputs are above V2. Using high values for R1 and R2, reduces the errors from the diode forward voltage, but increases the errors from the diode leakage and op-amp bias currents. Adding resistors with the same values as R1 and R2 in series with the non-inverting inputs will minimise the latter.

R3 and C1 form a power on reset circuit, which ensures it always starts up in the same state when power is first applied.

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