Thanks for the great suggestions, guys.

> Suppose you use 2 x 3V cells (6V), even using 1 diode to drop a bit the
VCC
> to the transmitter, and 3 diodes to drop the VCC to the processor, you

No, Wagner, I think you misunderstood this. The 2 cells are in series; the
negative is treated as ground, positive of the first (3V) as VCC for the
PIC, and positive of the second cell (6V with respect to gnd) powers the
transmitter. This way, I dont have to use a 3 pin regulator at all. The PIC
gets 3V, and the transmitter 6V. Of course, the PIC cell would always run
out faster than the other, as it effectively powers both, the PIC AND the
transmitter.

Anyway, I think the idea of using a charge pump is far more elegant than
mine. Especially since the PIC is a 16F628; I can use the hardware PWM,
right?

In which case, what might be a good value for the frequency? And would it be
asking for too much, if someone has a schematic with component values?

> The thing to observe; Is the processor able to drive the transmitter with
> its logic up to 3V while the transmitter is tied to 5V ?

Another potential problem I expect to come up! I am planning on powering up
the transmitter from the PIC thru' a transistor, and then, after a short
delay, use another bit on the PIC to send data.  Hope it works the way I
think it should!

Regards,

Anand Dhuru


>
> Wagner Lipnharski - email:  wagner@ustr.net
> UST Research Inc. - Development Director
> http://www.ustr.net - Orlando Florida 32837
> Licensed Consultant Atmel AVR _/_/_/_/_/_/
>
> --
> http://www.piclist.com hint: PICList Posts must start with ONE topic:
> [PIC]:,[SX]:,[AVR]: ->uP ONLY! [EE]:,[OT]: ->Other [BUY]:,[AD]: ->Ads
>
>
>

--
http://www.piclist.com hint: PICList Posts must start with ONE topic:
[PIC]:,[SX]:,[AVR]: ->uP ONLY! [EE]:,[OT]: ->Other [BUY]:,[AD]: ->Ads