John Smith wrote:
On 9/12/2010 7:04 AM, dave wrote:


JS - Why a Silicon Diode versus a Resistor
in the DC Output Line ? - iwtk ~ RHF
.
The resistance needed varies with current draw?

To drop the voltage from 5 to 4.4-4V ... as I originally said ... the
voltage drop in silicone diodes is around 6.8, it can vary some due to
type, manufacturing process, etc.

Regards,
JS

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.

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

John Smith wrote:
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

It's been a while.