AVR-Chat

On Wed, 3 Aug 2005 12:31:14 +0800 (CST) you wrote:

>
>Dear All,
>
>Kindly advise how to use optocoupler 4N25  to isolate microcontroller minimum system to Contactors :
>
>1. Output from Port 0.0 to Optocoupler 
>
>2. Ouput from Optocoupler to drive contactor
>
>Questions :
>
>1. What should i do with the base pin of the transistor
>
>2. What is the value of the pull up resistor to drive 12V DC to contactor
>
>Please comment.
>
>Thanks
>
>Mansur

How much current does the "contactor" need?
--
Ralph Hilton
http://www.ralphhilton.org
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