On Sat, 2007-05-26 at 07:13 -0700, Jim WA9YSD wrote:
> This will be the third time I have to send in my OMNI VI Plus to get the AUX
> Key circuit repaired. Could RFI be blowing this for me? How do I prevent
> this from going out? Is there a better fixe out there?
>
> K9TF/WA9YSD
>
>
> Keep The Faith, Jim WA9YSD
>
What is that circuit keying? Lots of amplifiers key significant voltage
and current which can fry the internal keying transistor and if the
keyed circuit is a relay coil, inductive kick from the coil adds insult
to the driver transistor.
It is quite practical to create a circuit using a small protected reed
relay or a couple MOSFET transistors that will key a few hundred volts
at 20 amps though a couple hundred volts at a quarter amp is usually
enough.
--
73, Jerry, K0CQ,
All content copyright Dr. Gerald N. Johnson, electrical engineer
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