Quote:
Originally Posted by terrykc
Quote:
Originally Posted by dagskarlsen
... I would like to see that relay following 20-25 hz.
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If that means that you doubt that the relay will do so, bear in mind that a special type of relay, called a vibrator, was successfully used for many years to generate HT supplies for valved equipment, such as radios, driven from car batteries! Moreover, they ran at 50Hz and tended to be used continuously for long periods, unlike the present application. |
Those vibrators are tuned to a specific frequency, and they need a little time to start up. And yes they works well. I have a PAX probably from 1948 doing that.
The vibrator starts when I go off-hook so it is ready when I have dialed.
Quite stable at 20H, in 2012!
dsk