Hi Jean-Paul,
That's probably the type of solution I'm looking at, but I was hoping to
be able to spend my way out of the problem rather than a complete
rebuild in a different enclosure.
Thanks!
Bob

On Thu, Jul 2, 2015, at 10:52 AM, Jean-Paul Louis wrote:
> Bob,
> I am not at all an expert in the MC34063A, but as you said, it is widely
> used in regulators for modern low voltage device chargers. I faced a
> similar problem with ham radio receivers, and I solved it with a
> simple modification.
> With a scope, I evaluated the amplitude of the residual noise at full
> load.
> Then I modified the feedback divider to raise the output voltage by a bit
> more than the peak voltage of the noise, and added a LDO regulator with
> proper capacitor decoupling, and got rid of all the noise.
> Lastly, I put the whole thing in an aluminum bow that I connected to the
> ground for EMI shielding, and
> a large capacitor on the 12 V input. That solved it in my SDR receiver.

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