Voltage regulators need a voltage excess to operate. Unless you have an LDO
(Low Drop Out) regulator you would need maybe 2V more than what you desire.
For example having a battery pack rated from 4V-6V (depending on charge),
you will not be able to regulate the voltage to 5V (a 7805 is typically like
this).

You would probably better off with a non-regulated voltage limiter, like a
simple zener circuit, or even better if you do it as an emitter follower. Or
you would need an LDO to 3.3V circuit. Or a DC-DC booster to 7V and then an
LDO on top of it to 5V.

Tamas


On Sun, Apr 25, 2010 at 3:57 PM, Jason White <
whitewaterssoftwareinfo@gmail.com> wrote:

> me being unable to measure current wouldn't it be easer and safer (for me)
> to put a $0.53  voltage regulator that can handle up to 35 volts and
> outputs
> 5 volts and a 150 ma current between my pic and power supply ?
>
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> Jason White - Python and C++ Programmer
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