[time-nuts] Power supply for OCXO using "USB power blocks"

[Mark Sims]

Usually they are very noisy, with the noise rising rapidly with load current.  goughlui.com,  lygte-info.dk, and a few others have published some tests.  I think bigclive has also done some tests.

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> How quiet is the output from those USB battery things..I've used one to 
run a RTL-SDR, but that's hardly a ultimate low noise receiver.