[GreenKeys] RS232 to TTY Loop Boards

[Lester Veenstra]

These looks good, possibly need external diodes that are shown in original
part.


Lester B Veenstra  MØYCM K1YCM W8YCM
lester at veenstras.com

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-----Original Message-----
From: Jim Haynes [mailto:jhhaynes at earthlink.net] 
Sent: Sunday, February 15, 2015 5:33 PM
To: Lester Veenstra
Cc: 'Bob Camp'; greenkeys at mailman.qth.net
Subject: Re: [GreenKeys] RS232 to TTY Loop Boards


Attached is someone else's paper on optocouplers - I think some of those
should be current production.  If they're all obsolete, well then we need to
find something new.
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