Hello Alexandre and Spehro,

    Alex, you don't want to use a transformer because of it's costs or to
save weight and/or space?

    If cost isn't your problem, I would suggest you to buy a transformerless
suply for 24V and step-it-down to 5V with a swithed-regulator like LT1173.
You can use an small transistor to switch the relay from the PIC output and
use the output from the LT1173 to power a 5V circuit up to about 300mA.

    LT1173 isn't cheap at about US$3.40 in Brazil.

    Best regards,

    Brusque

-----------------------------------
Edson Brusque
Research and Development
C.I.Tronics Lighting Designers Ltda
(47) 323-2138  /  (47) 9993-6453
Blumenau  -  SC  -  Brazil
www.citronics.com.br
-----------------------------------

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