[time-nuts] Switching regulator replacement for 7805
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?
Any simple idea will be worded in the most complicated way.
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