Peter Bindels wrote:
>> You don't have to use a MMTB4401 transistor.  Just about any jellybean
>> NPN will work here.  The zener voltage doesn't have to be exactly 5.6V
>> either, but should be at least a 2.5V or so less than your supply
>> voltage.
>
> Does this have to do with it not switching on/off often enough to
> provide a stable output voltage when you have less over-voltage?

I said several things, so I can't tell what "this" you are referring to.  In
any case the answer to your question is likely "no", since there is no
switching going on here.  This is definitely a analog, as apposed to
digital, circuit.


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