--- In [email protected], "David Heine" <davesn3@...> wrote:
>
> You are correct, an AC square wave where the O's and 1's have a different
> period. But not a sine wave like the "old" tinplate standard, created when
> rectifiers were expensive.
>
> Dave Heine
> Easton, PA
>
>
> -----Original Message-----
> From: [email protected] [mailto:[email protected]] On Behalf Of
> Don Thompson
> Sent: Wednesday, August 22, 2012 11:10 AM
> To: [email protected]
> Subject: Re: {S-Scale List} Re: We are going back to running AC
>
> Maybe I am wrong here, but isn't the current for DCC AC?
> Don
>
>
> ------------------------------------
>
> Yahoo! Groups Links
>
Right.
DCC is contolling different pulse widths of a square wave where the amplitude
remains the same at +/- 15v. The width of the pulse represents the one's and
zero's transmitted to the decoder.
These one's and zeroes can control speed, lights and multiple other functions.
The decoder figures it all out and performs the appropriate action.
Straight AC, the speed is controlled by varying the amplitude (from 0v to
+/-15v or therabouts, depending on the source transformer) of a sine wave
running at 60 cycles per second. Motors and lights will vary depending on the
amplitude.
You old Lionel or Gilbert transformer simply tapped into a different
trasnsformer winding via a sliding contact to increase or decrease the
amplitude.
There is a world of difference between the two.
Riuch G(ajnak)
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