> 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.
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