On 26 Jan 2004 at 21:46, Mike Harrison wrote:

> 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...!
>

        But they make pretty good varicaps.... ;-))

        Mark

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