🚀 go-pugleaf

Brian Kantor writes:

>Probably the simplest way to simulate the voltage drop of the old
>copper-oxide rectifier is to series several silicon diodes.  That
>way you'll have a relatively constant voltage drop despite a varying
>load, which a resistor would not give you.
>       - Brian

I'm not sure that is a good simulation; my vintage 1951 Simpson VOM
uses a copper oxide bridge on the AC ranges - so did all VOM's for
many years. Working from memory, I believe CuO rectifiers have:

   Low forward conduction drop  (necessary for good VOM performance)

   High series resistance  (not a problem in VOM's)

   Poor high frequency response - cutoff around 100 kHz, I think

   Low reverse blocking voltage

I'd try just one Si diode, and add a series resistor if necessary.

I believe CuO devices were used in "Varistors" also; low FCD would
be desirable here.

Happy holidays
Isaac
isw@cup.portal.com