I was thinking that if you wanted a simple on/off switch between your output
and your load that you can use a power mosfet like the IRFP260N from
International Rectifier, or something similar (or smaller) than that. These
power mosfets can handle way more than 1.5A that you need (up to 50A on this
one, I think) and has low on resistance. I am not sure if the ADG736 can
handle the current that you need it to handle.



-----Original Message-----
From: pic microcontroller discussion list
[mailto:PICLIST@MITVMA.MIT.EDU]On Behalf Of Jinx
Sent: November 2, 2002 8:52 PM
To: PICLIST@MITVMA.MIT.EDU
Subject: Re: [PIC]: Controlling resistance


> I was wondering if it were possible to use a mosfet/bjt triggered
> by 16f628?

An electronic variable resistance can be made from FETs. For
example a 4066 (which has FET gates) or similar quad CMOS
switch can be controlled by PWM to get an effective resistance
between Ron and Roff. Note though that Ron for a 4066 is a few
tens of ohms. The best in a chip is possibly the ADG736 and
that's 4R5. Discrete FETs can have Ron in milliohms

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