A picture would be very nice.
The valvules draw around 2A

Octavio Nogueira
Tato Equipamentos Eletr=F4nicos Ltda
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-----Mensagem original-----
De: pic microcontroller discussion list [mailto:PICLIST@MITVMA.MIT.EDU]
Em nome de Bob Blick
Enviada em: quinta-feira, 4 de setembro de 2003 13:58
Para: PICLIST@MITVMA.MIT.EDU
Assunto: Re: [EE:] 12VDC to 24VAC help


I changed the tag to EE.

Octavio said:
> I have a irrigation controller and some valvules that
> need 24VAC to operate but I only have 12VDC.
>
> I was thinking about using a pic to drive a Power
> Mosfet H-Brige at 60Hz, I know it will be square
> wave but will this work? Any better idea?

That'd be 12VAC.

Easiest would be a transformer with 24V center tap output, ignore the
input. Use two transistors, four resistors and away you go.  So you use
it as a three wire inductor. center to +12, collectors to either end.
Make a free-running oscilator. You'll get 24VAC from end-to-end.

If you need a picture I'll draw one tonight.

Cheers,

Bob

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