Re: How To switch High voltage with Low voltage
- From: "Tom Bruhns" <k7itm@xxxxxxx>
- Date: 31 May 2006 08:42:47 -0700
Computer_Hell wrote:
hello all i have a question im sure some one knows the answer to.
i have a microcrontroler that outputs 3.3v on it GPIO pins
what i need to do is use this 3.3v to switch a seperate and isolated
12v source
I thought a transistor mite work but wasnt sure how to do it or what
type of transistor to use
any thoughts on this would be great
Depending on the current in the 12V circuit, the switching speed
required and the level of isolation you need, and possibly some other
things, you could try a mechanical relay (which might itself need a
transistor to drive enough coil current), an optoisolator (there are
many types, from low power ones to ones that can switch back-to-back
power mosfets on and off to control bidirectional currents), or for
some very specific sorts of isolation, a transistor circuit. Another
possibility might be to drive a high frequency square wave out of the
microcontroller, through a transformer, to a rectifier, to the gate of
a power mosfet. But not all of those ideas would work for every
possible situation that fits your very short description. Tell us
more.
Cheers,
Tom
.
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