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Re: Ray, the whole point of using a choke input filter...

How right you are. I tried to show this with screen shots, from the PSUD, of the huge charging spikes present in a supply with an input choke that does not meet critical inductance.

No one seemed to notice. I know people respect you so I am showing this screen shot again in hopes that people will take notice.

A choke input supply with too small a choke is not a choke input supply at all. It will not have the regulation of a choke input supply and it WILL have the spikes of a cap input supply.

This circuit is drawing about 80ma. but we have large (over 350ma.) charging current spikes. More important than the amplitude is the shape. Those sharp spikes will, as you say, create RF that radiates through out the amp.

With a proper choke in place and the circuit adjusted to draw the same 80ma. DC, the charging currents are held down to just over 25ma. peak and are Sinusoidal, no spikes = no RF.

Tre'
Have Fun and Enjoy the Music
"Still Working the Problem"


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