On Mon, 26 Jan 2004 12:54:54 -0800, you wrote:

>Just for kicks, I decided to do a quick bench test of a 1N4004 and =
compare
>it to a UF4004 to see the reverse recovery times (trr) first hand.  I =
used
>an HP3314A signal generator to drive the rectifier connected in series =
with
>a 50 ohm load and measured the trr with a Tex 2456DMS scope.  The signal=
 was
>a square wave at 100KHz at 10 volts p-p.
>
>The results:
>
>1N4004  4 microseconds trr (!)
>UF4004  55 nanoseconds trr
>
>Interesting.

It's hardly news that 1N diodes are lousy for switchmode applications...!

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