[CQ-Contest] LPT: KEYING

Dale L Martin kg5u at hal-pc.org
Thu Dec 19 11:22:36 EST 2002

I went to yahoo.com, typed in 4n25 opto isolator keying circuit and came up
with a 11 hits.

Now, I don't know what a COW keying circuit is, but maybe you can modify
what you find on yahoo to a COW keying circuit.

Try it.

dale, kg5u

> 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
> keying.
> Does any one have any information on this or a schematic.
> Tank you
> N3OW
> Jay Mason
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