I am using surplus low power LEDs from AllElectronics.com.  Probably  
not hi-efficiency.
MA

> On Nov 22, 2008, at 11:17 AM, Stephen R Phillips wrote:
>
> You might be better served using a transconductance amplifier on the  
> output of the LED. That of course also depends on how fast, how  
> noisy, how sensitive etc you wish the device to work.  You may be  
> able to use the device as a linear isolator without much difficulty  
> as well (using a transimpedance amplifier on the input LED). I am  
> curious what type of bandwidth can be obtained from a simple coupler  
> like that.  Are you using high power LED's or normal 'high  
> efficiency'?
>
> Stephen
>
>> ----- Original Message -----
>> From: "Michael Algernon" <agscal@gmail.com>
>> To: "Microcontroller discussion list - Public."
>> <piclist@mit.edu>
>> Sent: Saturday, November 22, 2008 8:08 PM
>> Subject: [EE]: DIY opto-isolator furrgetaboutit
>>
>> I have built a do-it-yourself opto-isolator using twoT13/4
>> red LEDs
>> pointing at each other.
>
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