My point was that you aren't going to get a better match from 4 HP
separate diodes (which may or may not come from the same batch) than
the integrated ring so that mod is not worthwhile
Do you agree?
On Apr 19, 2007, at 4:12 PM, Dr. Gerald N. Johnson wrote:
> On Thu, 2007-04-19 at 13:33 -0700, Kevin Purcell wrote:
> <SNIP>
>> Not a great data sheet (there are better out there but I can't
>> find it
>> again).
>>
>> <http://www.datasheet4u.com/html/N/D/4/
>> ND487_CaliforniaEastern.pdf.html>
>>
>> The specs are very similar to the HP diodes for both forward and
>> reverse voltages and switching time. And of course they're all
>> matched by design :-)
>
> Actually HP used to claim that Schottky diodes from the same
> envelope or
> batch were very closely matched which is a lot closer than silicon or
> germanium junction diodes matched. Remember that the junction in a
> Schottky diode is at the interface between metal and a uniform
> chunk of
> doped silicon.
>>
> <SNIP>
>> 73
>> N7WIM
>>
>> On Apr 19, 2007, at 6:46 AM, jmalloy wrote:
>>
>>> Also: are the diodes mentioned in the KW7CD article still available?
>>> (They're spec'd as HP 5082-2800 and HP 5082-3081) If not, does
>>> anyone
>>> know of substitutes?
>>
>
>
--
Kevin Purcell
kevinpurcell@pobox.com
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