[CQ-Contest] LPT: KEYING

Jay Mason N3OW n3ow at rcn.com
Wed Dec 18 18:20:01 EST 2002

I am looking for information that i had seen on a website for the
construction of a COW keying circuit using an opto isolator 4n25 to do the
Does any one have any information on this or a schematic.
Tank you
Jay Mason

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