AVR-Chat

-----Original Message-----
From: AVR-Chat@yahoogroups.com on behalf of David Reaves
Sent: Sat 19/06/2010 17:07
To: AVR-Chat@yahoogroups.com
Cc: David Reaves
Subject: [AVR-Chat] Re: ATMega16 I/O port protection diodes
 
>This is exactly the purpose logic opto-couplers ("opto-isolators")  
>were invented for. Complete isolation, of several kV.
>
>You can buy them in SMD and DIP packages, in singles, dual and quad  
>configurations. A couple dollars and you're safe.
>Very cheap insurance.




No, the original poster was wishing to power an LED (for a railway signal) down a long length of cable, without needing power supply at the far end. An optoisolator is no use in this situation.

-- 
Tim Mitchell


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