Re: Circuit Symbol

On Thu, 19 Dec 2024 09:09:54 -0600, Dennis <dennis@none.none> wrote:

On 12/18/24 21:20, john larkin wrote:
>

 
I vaguely recall that they oscillated at somethig over 100 Hz. I
powered an old car radio with 60 Hz instead of the vibrator, and the
radio's step-up transformer ran hot.
 

They ran at a frequency as high as reasonable for a mechanical device.
This allowed for a smaller transformer.

Vibrating contacts were the first switching regulators. Auto
generators - before alternators - used a hysteretic oscillating
contact closure to drive the field coil. That was very efficient and
not especially reliable.