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1. [TRLog] Opto Iso Keying (score: 1): Author: punkymcd@pacbell.net (punkymcd@pacbell.net); Date: Tue, 03 Aug 1999 20:31:25 -0700; Hi, 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. 73, Don, W6OA -- FAQ on WWW: http://www.cont; /archives//html/TRLog/1999-08/msg00012.html (6,882 bytes)
2. [TRLog] Opto Iso Keying (score: 1): Author: n6tr@teleport.com (n6tr@teleport.com); Date: Tue, 3 Aug 1999 20:35:26 -0700 (PDT); 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 t; /archives//html/TRLog/1999-08/msg00013.html (7,119 bytes)
3. [TRLog] Opto Iso Keying (score: 1): Author: punkymcd@pacbell.net (punkymcd@pacbell.net); Date: Tue, 03 Aug 1999 20:43:17 -0700; Sorry forgot to refer the article. It appeared at the URL www.qsl.net/ae0q/contest/opto_key.htm. Used for a serial and LPT printer port keying. -- FAQ on WWW: http://www.contesting.com/trlogfaq.html; /archives//html/TRLog/1999-08/msg00014.html (7,519 bytes)

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