> All conventional silicon diodes, of which the 6A10 is one,
> have a forward conduction voltage that starts at about .5 volts. The forward
> conduction voltage is not linear - applying additional voltage to it causes a
> "clamping" effect, while the current increases dramatically. Regardless of the
> amount of current passed, the voltage will not rise to more than about .7
> volts,
> right up to the maximum current rating of the diode. I like the 6A10 because
> they are inexpensive and have a surge current rating of 400 amps, which should
> be enough for any ham application.
> If you can locate a graph of forward voltage vs current for a typical silicon
> diode, this should become more clear.
I don't see why hot carrier power diodes can't be used as Ammeter
protection, I don't know how
much they cost or if they are found at HAMfests. The typical 35 Volt piV
rating is irrelevant in
this application. The speed of a hot carrier power diode will surely surpass
silicone.
Adding a resistor in series with an Ammeter for protection should
"recalibrate" it detrimentally,
but when using a mil-Volt meter across a shunt, a series resistor could bring
it into accuracy.
--
Ron KA4INM - Remember, the government cannot give anything to anyone
that they have not first taken away from someone else.
(like you and me)
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