LM393 is actually a comparator (almost the same as an opamp)May be I'm wrong, but isn't there a flaw in this whole idea of the O/P? A "circuit breaker" should do just that, break the circuit. A mosfet does not fill that function.
one slight problem i have, my results dont show that the whole circuit responds to a fault current in the LED+2.2Kohm resistor, it protects the circuit from overvoltage by comparing, reference to supply, will fix by adding the 22V zener, to stabilize ref voltage that much is true but what can i do to actually ensure that once the current in the LED+2.2kohm resistor goes past 4.5mA*root 2(peak current) the current gets reduced to 4.5mA again as quickly as possible to ensure that the LED doesn't burn out.One slight issue with your circuit, the references are all created by voltage dividers.
You'll need to pick something like a 22 Volt Zener diode to have a solid voltage reference.
Without a Zener/bandgap ref or similar stable voltage reference (independent of source voltage), measuring supply voltage is rather difficult.
It is a circuit breaker that responds to a fault current caused by an overvoltage.So what you want (are trying to do) is a current limiter not a circuit breaker. A circuit breaker physically "breaks" a circuit, not just shuts it off.
Wouldn't a current mirror be a better type circuit to do what you want?
i would like the 555 timer set up as an astable oscillatorIf you are trying to get a 1 shot out of a 555 at power on, the reset needs to be held low for the first little bit.
Change the left resistors/caps for pulse width, the ones to the right of them for startup delay.
from what i understand connecting pin 2 and pin 6 together in that configThere's no other signal, though. No connection to pin 3?
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