David VanHorn wrote:
>> I was thinking about regulating the Vdd using an amplified diode circuit.
>> Basically the input voltage could be varied between 4-7.2V and I am going to
>> set this circuit to 3.3V. The load is around 1-2mA. I was wondering if there
>> is any con about this?
>>     
>
> As shown, this is not a regulator.
> I think what you're intending is an emitter follower on a zener
> regulator, but a single component monolythic solution would be much
> better, and probably more efficient as well.
>   
I think his verbiage is correct, tho... he is amplifying a  zener diode. 
At 2mA you could use a 3.3V
zener by itself, methinks.

A LM317 would be a better device, agreed.

--Bob
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