I don't know the first thing about where to even start looking for the result I'm looking for ... but what I want, is a circuit ... or maybe a certain transistor ... that will remain "closed" when the voltage at the base is 5 volts, but when that voltage gets to 4 volts or less, I need that transistor to turn on - preferably with maximum saturation. I would prefer that it also does not even turn on a little as the voltage approaches 4 volts, but remains closed until that voltage hits 4 volts.
Now, it would be OK if it had some kind of marginal transition from zero saturation to fully saturated once it hits that 4-volt threshold ... like say for example at 4 volts, it starts to turn on but is not fully saturated until it reaches 3.9 volts or whatever ... a 1-volt margin in that characteristic would be acceptable.
I hope my question makes sense and that it's clear what I'm looking for. If not, please let me know.
Thank you,
See attachment for a simple visual.
Now, it would be OK if it had some kind of marginal transition from zero saturation to fully saturated once it hits that 4-volt threshold ... like say for example at 4 volts, it starts to turn on but is not fully saturated until it reaches 3.9 volts or whatever ... a 1-volt margin in that characteristic would be acceptable.
I hope my question makes sense and that it's clear what I'm looking for. If not, please let me know.
Thank you,
See attachment for a simple visual.
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