[VoIP] Coin relay controller

[Donald Froula]

It sounds like some kind of coupling or overload is
going on with the transformers. I use the exact same
arrangement to make a power suppply for a Nixie tube
clock I built. I get 170 VDC, unloaded. I did use an
extra winding to boost the voltage a few volts to
overcome droop under load.

Don

--- Mark Rudholm <mark at rudholm.com> wrote:

> Donald Froula wrote:
> > ...only if you cap filter it. Wouldn't unfiltered,
> > bridge rectified have about the same RMS as sine
> AC?
> > The frequency is doubled, of course.
> 
> I find line AC through a 2:1 transformer then full-
> wave rectified and filtered with a 220µF cap yields
> about 78VDC, which is just about perfect since it's
> enough to power the higher voltage coin-relays but
> not excessive for the lower voltage ones.
> 
> Oh, and thanks for the Bellcore, etc documentation.
> Very helpful stuff.
> 
> So helpful, I'm toying with the idea of supporting
> the Stuck Coin and Initial Rate tests...
> 
> -Mark
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