DEC H7822 power supply

[Christian Corti]

On Thu, 12 May 2022, Toby Thain wrote:
> It does not, due to unidirectionality.

But in general, diodes can be (and are) used as controlled AC switches. 
One good example are the head select diodes in disk drives. You apply a 
direct voltage and thus "open" the diode. You then have a overlayed 
alternating voltage coming from the head coils passing through the diodes.
This is then AC coupled to the preamplifier.

Christian