Thread: REN Booster
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Old 22nd Oct 2012, 11:43 pm   #40
Refugee
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Join Date: Apr 2012
Location: Worksop, Nottinghamshire, UK.
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Default Re: REN Booster

I have thought about this for some time.
They used to have boxes that worked like a party line except both users could use it at the same time.
They had a Ni-cad battery in them that was trickle charged at a rate well below the level that takes the line off hook.
With this you could add a small audio amp without bias. This could just have a couple of zena diodes in series in opposite directions to stop the speech ringing the bells.
I would run two transistors into a 12-0-12 transformer from a 4-6 volt battery and the primaries connected to the bell capacitor line.
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