[Diy_efi] photocoupler?

[bcroe at juno.com]

I hope you are not planning to use a photocoupler input 
diode in series with a fuel injector.  The current may blow 
it up, if not the turn off spikes.  The voltage drop across an 
LED is rather high; probably will affect injector operation.

Bruce Roe

21 Feb 2003 Tony Petroski <tp11 at uow.edu.au> writes:
> oh, AC input is i think just terminology associated with the fact that
> the INPUTS have LED diodes going in both directions. i.e. say pin 1 &
> pin 2 are connected with diode in direction pin 1 & pin 2. Then
> corresponding to the AC input, another diode then follows pin 2 to 
> pin 1. 
 
> This is the only difference to the Fairchild H11L1. May i ask, the
> following... 
> 
> If i intend to use such a photocoupler inline with the injector
> circuit which is 12V & nonpolar, will the Fairchild H11L1 work as the
> LED diode only goes in one direction ?
> 
> Can someone further add to the terminology of the word 'nonpolar'? I
> do understand, non-polar means that the device doesnt have any
> preferences or requirements to which terminal is anode or cathode.

> Tony PETROSKI (Postgraduate)

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