You can use a standard bipolar transistor, same circuit as for CT.
Barry
On 1 Sep 01, Dean Norris wrote:
> I need a 4N33 for serial port keying. Is that the only device that will
> work? Rad shk doesn't seem to have them. Any alternatives?
>
> Dean
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Barry Kutner, W2UP Internet: w2up@mindspring.com
Newtown, PA Frankford Radio Club
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