At 10:49 12/23/98 -0400, Ricardo Ponte G wrote:
>        1.- What is a MOV ???

metal oxide varistor: a resistor which becomes more conductive above a
certain voltage, and is used to suppress voltage peaks

>        2.-  What is a bidireccional tvs ???

a tvs (transient voltage suppressor) is basically a zener diode designed to
withstand high peaks. it becomes bidirectional when two of them are in
series but reversed polarity, and you can buy them integrated like that.

>        3.- Can be an EMI filter helpful (2 bobbins and one capacitor) ?

it depends a lot on your setup. obviously you get something back from the
solenoid to the pic, and it's not easy to tell where exactly you get it
back without seeing how it's all set up. it could be from the solenoid over
the ac power line into your pic's power supply, or through the relais with
which you switch the solenoid, or wires lying around... but if it's close
to the solenoid, it might be helpful (even though i'd add a mov to it).

ge