[Diy_efi] Photocouplers

[Mike]

It is important.

You want to make sure it switches faster then the portion
of the waveform across the opto which could exceed its
reverse recovery time.

So, to be sure I use the UF series, for two reasons,

1.	They are faster than 1N series
2.	Because they are required to be built to a faster
	spec there are less cheap nondescript versions
	around and are therefore more reliable.

By all means make a suggestion to use lower spec parts on
your own system if you dont care about the outcome but
dont give people advice to take shortcuts with systems
you are taking responsibility for - unless of course
you risk assumptions and happen to work for nasa <sigh>

rgds

mike



At 01:18 AM 26/2/2003 -0600, you wrote:
>Any switching diode will work; I don't think speed is 
>that important.  Bruce Roe
>
>26 Feb 2003 Mike <erazmus at iinet.net.au> writes:
>> Yes and make it a fast diode, instead of the
>> 1N400? series use a UF400? series etc.
>
>> mike
>> 
>> At 12:53 AM 26/2/2003 -0600, you wrote:
>> >If you have a single opto input diode, put a second diode 
>> >in parallel with it but wired the other way.  This will short 
>> >out any reverse voltage spikes that come through the 
>> >resistor without breaking down the photo diode.
>> >
>> >Bruce Roe
>
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