[USRP-users] 12V to 6V Converter for USRP Supply

Marcus D. Leech mleech at ripnet.com
Sun Feb 17 20:46:01 EST 2013

On 02/17/2013 08:31 PM, Jeff Lambert wrote:
> You could reduce the dissipation by using some zener diodes to drop 
> the voltage before the regulators.  And you can parallel regulators to 
> provide higher output.  At the end of the day, a linear regulator is 
> likely to be less noisy than a switch-based DC to DC converter.  More 
> expensive does not mean better performance.  There is already a linear 
> regulator on the board, so you really don't need the best power supply 
> anyway, unless for some reason you need better noise performance than 
> it already offers.
> -Jeff
You can only parallel linear regulators if you have fractional-ohm, 
high-watt, "spreader" resistors linking them together.  If you 
direct-wire them,
   nearly-invariably, one regulator tries to source nearly all the current.

Marcus Leech
Principal Investigator
Shirleys Bay Radio Astronomy Consortium

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