Have you tried this?
No, can't do physical moment.
Pretty certain approach is good though- well proven principle (famous last words). A big junction area BJT is the key. It gives a very low Vsat at decent IC (see graph).
Just to clarify, the circuit will only start functioning around 1.2V in theory, but 3V or so say, in practice, but the voltage drop (equivalent to rec diode VF) will only be 10s of mV as previously stated.
So, for example, with 3V input there will be no output, but with 4V input there will be 4V output, as near as damn it that is.
Don't worry about the gross error on circuit- that is standard with me and is due to laziness.
Feel free to analyse the circuit and make suggestions for improvements- I would appreciate that. Also point out any goofs.
No doubt, the pair of us can turn it into a nice practical circuit. Then it can be optimised and job done.
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