hi,
If you are into designing circuits of various types, I would suggest downloading the free LTspice simulator.
In that way you can try out different circuits under different conditions and temperatures.
There are number of LTS user on ETO who would be happy to help.
Thanks for that information. I will do what you suggested. However, I thought you insinuated that the circuit i posted wasn't ideal, so I wanted to ask how it may be improved. Or at least in what area or respect it needs improvement. Thanks.M