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From: Dennis <dennis@none.none>
Newsgroups: sci.electronics.design
Subject: Re: Circuit Symbol
Date: Thu, 19 Dec 2024 09:09:54 -0600
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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.