[App_rpt-users] Raspberry Pi voltage

N6GKJ Land n6gkj1 at gmail.com
Thu Aug 1 15:51:46 UTC 2019


I don't use the micro USB connector. I plug right onto the 40 pin header
and use a 3 amp buck converter set to 5 vdc. Since I have gone to that
configuration, I no longer have those issues. Variable voltage 3 amp buck
converter is $2 - $3 on eBay. I put +12 vdc in and set the multiturn pot
for +5 vdc out then hook +5 vdc to pin 2 and ground to pin 6

On Thu, Aug 1, 2019, 5:42 AM Len Griffin <lengriff at optimum.net> wrote:

> We’ve had some intermittent problems with Asterisk shutting down at our
> K2ETS remote site, and I’ve discovered something important. The Raspberry
> Pi MINUMUM operating voltage is 4.8v. The USB cable you use to power it is
> CRITICAL. To check,  I used a USB cable which I cut and stripped, and
> measured across the red and black conductors. I plugged this into a USB
> port on the Pi. I checked 4 cables on a Pi running with one URI connected,
> and got 4 DIFFERENT Pi voltages. The lowest reading was 4.5 volts on 2
> cables! One read 4.7 volts. Finally, the fourth one read 4.92 volts. These
> cables are not rated for current, so you must check them!
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