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Vintage Telephony and Telecomms Vintage Telephones, Telephony and Telecomms Equipment

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Old 27th Oct 2012, 4:22 pm   #41
terrykc
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Join Date: Nov 2010
Location: North Hykeham, Lincolnshire, UK.
Posts: 506
Default Re: REN Booster

Quote:
Originally Posted by dagskarlsen View Post
... Those vibrators are tuned to a specific frequency ...
Yes, by the simple expedient of adding a weight to an extension of the paddle operating the switching contacts. This effectively made a pendulum, resonant, usually, at 50Hz.
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