Optocouplers differ only in frequency range what they can switch and current
(on the transistor side). I prefer to use CNY17, which handles 110 mA very
well. The 4N3x series are limited around 30mA. If you want to drive relays
(like in an SO2R box) the 30mA is usually not enough.
All the optocouplers I have seen are inerchangable.
73 de Zoli HA1AG
> -----Original Message-----
> From: Dean Norris [mailto:dnorris@k7no.com]
> Sent: 02 September, 2001 02:56
> To: Writelog@contesting.com
> Subject: [WriteLog] 4n33
>
>
> 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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