[TRLog] Opto Iso Keying

[n6tr@teleport.com]

> Can anyone give me a good reason for the diode in series with the LED in
> this circuit? It looks like a diode in series with another diode (LED)
> to me.

Not sure of what circuit you speak.  If the current is being set with
a current limit resistor, then you shouldn't need a second diode in
series.  However, removing it will change the resistor value to get the
same current.

Tree

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