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

[Bob Camp]

Hi

If you use the typical eBay units, they have a *lot* of noise. There are devices like the Linear Tech “switchers on a chip” ( = Silent Switcher) modules that can be quieted down pretty well. You needed a good board layout to do it though. They claim to have reduced that problem with the latest versions. 

Bob





From: jimlux
Sent: Saturday, March 9, 2019 9:00 PM
To: Discussion of precise time and frequency measurement
Subject: [time-nuts] Power supply for OCXO using "USB power blocks"

Has anyone tried a +5V to +15V DC/DC to run an OCXO, getting the 5V from 
one of those rechargeable USB power bricks.  I was thinking about 
portable operation.

In my case, the OCXO is something like a Wenzel streamline. I would 
think that the DC/DC probably has some noise, but maybe DC/DC to a 
higher voltage, then a good linear regulator to clean it up (or would 
the radiated noise just leak around).

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.

jim

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