Tom Gardner wrote:

-----------------------


https://www.flickr.com/photos/128859...in/dateposted-
public/

It took me 5 minutes to do a spice simulation
sufficient to generate such a picture.

The components were an ideal ac voltage source,
a diode, an ideal capacitor for smoothing, an
ideal resistor for the load, and an ideal resistor
in series with the smoothing capacitor representing
the smoothing cap's ESR.




** The REAL AC supply is not an good sine wave, it is normally somewhat flat topped. Take a look on a scope using a 10:1 probe.

Transformers have significant resistance in their windings, so you need to add some on the AC side of the simulation. The rising part of the saw tooth wave should not be too short, as it will be with zero source impedance.

If you wish to see reality, forget trying to sim it.

In this case grab any unregulated transformer wall wart, put a resistor across the output and scope the voltage across it.

Takes only seconds and leaves no room for doubt.



..... Phil