[time-nuts] Switching regulator replacement for 7805

Attila Kinali attila at kinali.ch
Sun Dec 4 17:59:36 EST 2016

On Sun, 4 Dec 2016 13:28:44 -0800
jimlux <jimlux at earthlink.net> wrote:

> I little series L and another C (so you have a pi low pass) can make a 
> huge difference.  If the load current is reasonably constant, then the 
> drop across the series R of the L will be constant, so you can bump the 
> dc/dc output to compensate.  It's pretty easy to get 60dB of rejection 
> from a C-L-C pi, and for 2MHz, the parts are physically small.

Wouldn't it be better to use a ferrite bead instead, for this application?
The much lower series capacitance and thus higher self-resonance frequency
should help damping the spurs.

Or am I missing something?

			Attila Kinali

Malek's Law:
        Any simple idea will be worded in the most complicated way.

More information about the time-nuts mailing list