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[TRLog] Opto Iso Keying

Subject: [TRLog] Opto Iso Keying
From: n6tr@teleport.com (n6tr@teleport.com)
Date: Tue, 3 Aug 1999 20:35:26 -0700 (PDT)
> 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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