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Ringing Transformer

colum

Jul 25, 2013
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I believe that an old system called a ringing transformer was used by the telephone company to convert 60 hz 120 v to 20hz 40 volt AC
it used 2 transformers 2 transistors and 2 large capacitors and many small resistors and no ICs.
I want to build one for a discrete 400 hz. I have the original one at 20 hz and the wave shape is excellent
so I wonder if someone would send me the wiring diagram I would appreciate it
Many thanks. Jeff
 

davenn

Moderator
Sep 5, 2009
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I want to build one for a discrete 400 hz.

A transformer for use at 60Hz, give or take a little, will not work at 400Hz
The losses would be substantial. You would need an appropriate 400Hz transformer
Commercial aircraft use 400Hz power system

Maybe you could source some old scrap aircraft power system parts
 
Last edited:

colum

Jul 25, 2013
169
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Jul 25, 2013
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Thanks Davenn, I just remembered I tried to use a 60 hz to a 350 hz and it did not work and now I know why you saved me from another boondoggle...Jeff
 
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