On 9/12/2010 10:39 AM, dave wrote:

...
I was taught six tenths for a Si diode rectifier, three tenths for Ge.

To keep the voltage constant, while current draw varies, requires a
variable resistance. I assume this happens inside the diode.

The old germanium I have measured tended to be close to 0.5v. The
schottky ~0.2 = ~0.4 unless under heavy loads ... and of course, there
are exemptions to the rule ...

Regards,
JS