I simulated and it is running, your analysis that both transistors would remain ON seems right, but adding series resistor to current source and taking output from it turns it into voltage source.You did it in LTSPICE. what does the simulation say?
What I see is a current source that feeds a resistor and two PN junctions. Most of the current will go through the PN junctions, making the resistor redundant. Both transistors will be turned on, and the LED will be off always, since there is no voltage left across it.
nope I'm 34Is this homework / school project?
ak
please post circuit diagramIts do-able with the addition of 2 more resistors but its poor circuit design as it won't be stable over temperature and will need transistor selection. Here's the trace to show what's possible:
View attachment 272503
I want real working circuit, source would be generic photo transistorDo you want a real circuit that will work well in practice, or just something you can simulate?
If you want a real circuit, what would be the source of the input current?
Then a transistor circuit will not give very stable or accurate operation.I want real working circuit
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