Schematic / recommendations for external power source

Discuss KerberosSDR - 4x Coherent RTL-SDR
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mkmer
Posts: 1
Joined: Sun Oct 13, 2019 8:04 pm

Schematic / recommendations for external power source

Post by mkmer » Sun Oct 13, 2019 8:07 pm

I'm looking to power the Kerberossdr with an external 5v power source (other than USB cable) - possibly drilling a standard barrel type connector to source the power. It would be VERY helpful to have a general schematic to located these connection opportunities.

Anyone else tried this? Any recommendations?

myke
Posts: 37
Joined: Wed Aug 28, 2019 7:03 pm

Re: Schematic / recommendations for external power source

Post by myke » Mon Oct 14, 2019 3:12 pm

My suggestion would be to use something like https://www.amazon.com/Converter-Regula ... 01&psc=1

barely can buy parts to build cheaper than that.... opening the case and playing with power can cost you a LOT more...
Other choice might be an old micro USB cable I cut - identify the power connections and then put whatever type of power adapter you want on the open end... 3.5mm .... molex .... But lots of inexpensive 5v 3amp choices out there!!

ac8dg
Posts: 10
Joined: Fri Jul 19, 2019 12:37 am

Re: Schematic / recommendations for external power source

Post by ac8dg » Mon Oct 14, 2019 3:41 pm

I was curious what I could do with the 40 pin connector as access to the 5vdc power connection , I have read very little about anyone using that installed interface... So If anyone has ideas.. It would be appreciated

ckoval7
Posts: 15
Joined: Fri Sep 27, 2019 8:54 pm

Re: Schematic / recommendations for external power source

Post by ckoval7 » Mon Oct 14, 2019 4:12 pm

ac8dg wrote:
Mon Oct 14, 2019 3:41 pm
I was curious what I could do with the 40 pin connector as access to the 5vdc power connection , I have read very little about anyone using that installed interface... So If anyone has ideas.. It would be appreciated
Supposedly it's for interfacing directly with the RPi, but:
  • You still need to power both devices separately
  • You need to take the calibration board off to remove a jumper that does ???
  • They didn't seem to communicate over that interface when I tried it
So over all, it doesn't seem useful, at least for now.

rtlsdrblog
Site Admin
Posts: 2434
Joined: Mon Nov 19, 2012 11:54 pm

Re: Schematic / recommendations for external power source

Post by rtlsdrblog » Thu Oct 17, 2019 8:55 am

For the 40 PIN header only the 5V and GND pins are connected, and these match up with the pins on the Raspberry Pi (USB ports facing out). So in theory you can power the KerberosSDR and the Pi with a single 3A supply. But this probably won't be enough power since the Pi gets pretty power hungry when in high CPU processing.

But yeah you could use those 5V and GND pins to connect up to your own external power supply.

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