TheEngineer
New Member
I have two circuits working independently, one has a LM339 comparator and the other has an LM1458 Dual op-amp that is used as a comparator. There is a feedback resistor on all outputs of the 339 but not on the LM1458. I know that the feedback adds hysteresis and keeps the output from oscillating, but why aren't they needed on the circuit with the 1458?
This is the circuit with the 339:
And here's the one with the 1458:
**broken link removed**
This is the circuit with the 339:
And here's the one with the 1458:
**broken link removed**
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