Rock64 Power Supply Polarity
#10
(12-18-2017, 09:33 AM)dkryder Wrote:
(12-18-2017, 08:30 AM)xalius Wrote: There are no -5V anywhere on the board... why does this keep coming up? DC input is a positive 5V potential difference vs GND....
good question. several new members raising the issue of -5v.  so maybe because some other boards they know about and think those boards have -5v they come to the rock64 forum knowing very little about the board and start making assumptions? i've noticed just about the same thing with the issue of supplying 5v to gpio, that has been raise in several threads by i guess folks from rpi and others reading that it is done. of course it is done by many but that does not mean it is good thing to do. rock64 has some voltage and surge protection on the proper 5V in connector line and does not have that on the 5v gpio lines. as well as any diodes on the proper 5v line will of course mess with 5v from gpio.  i'm sorry for being crass by mentioning this but it is entirely possible for nutrition and energy to be supplied to the human body by putting a feeding tube in the anus. but usually folks just eat and take supplements via oral, the mouth. so, apply 5v energy via designed inputs and not designed outputs.

The -5V is neutral. Most adapters have a +5V, -5V (neutral), and ground. Personally, I do not like to refer to the neutral as -5V, though that is how it is refferred to in other posts on this forum. The barrel jack on the board has 3 pins connecting it to the board. Is the third pin for structural integrity then?

(12-18-2017, 10:57 AM)nmhart322 Wrote:
(12-18-2017, 09:33 AM)dkryder Wrote:
(12-18-2017, 08:30 AM)xalius Wrote: There are no -5V anywhere on the board... why does this keep coming up? DC input is a positive 5V potential difference vs GND....
good question. several new members raising the issue of -5v.  so maybe because some other boards they know about and think those boards have -5v they come to the rock64 forum knowing very little about the board and start making assumptions? i've noticed just about the same thing with the issue of supplying 5v to gpio, that has been raise in several threads by i guess folks from rpi and others reading that it is done. of course it is done by many but that does not mean it is good thing to do. rock64 has some voltage and surge protection on the proper 5V in connector line and does not have that on the 5v gpio lines. as well as any diodes on the proper 5v line will of course mess with 5v from gpio.  i'm sorry for being crass by mentioning this but it is entirely possible for nutrition and energy to be supplied to the human body by putting a feeding tube in the anus. but usually folks just eat and take supplements via oral, the mouth. so, apply 5v energy via designed inputs and not designed outputs.

The -5V is neutral. Most adapters have a +5V, -5V (neutral), and ground. Personally, I do not like to refer to the neutral as -5V, though that is how it is refferred to in other posts on this forum. The barrel jack on the board has 3 pins connecting it to the board. Is the third pin for structural integrity then?

I actually just answered my own question. The 5V barrel wall adapter for the rock64 (or pretty much any barrel adapter) has only 2 wires, thus it is +5V and either neutral or ground, whatever you want to call it. Usually when you hook up electronics to +5V and ground (with larger electronics), it causes a short in the breaker. But I guess with this board, the returning voltage is so minimal that it doesn't matter

Here is a website that explains all this positive, negative, and ground scenario
https://electronics.stackexchange.com/qu...l-and-grou
  Reply


Messages In This Thread
Rock64 Power Supply Polarity - by marillionkb5 - 09-22-2017, 01:31 PM
RE: Rock64 Power Supply Polarity - by nmhart322 - 12-15-2017, 06:16 PM
RE: Rock64 Power Supply Polarity - by Lamensis - 12-16-2017, 04:52 PM
RE: Rock64 Power Supply Polarity - by nmhart322 - 12-17-2017, 06:00 PM
RE: Rock64 Power Supply Polarity - by Lamensis - 12-18-2017, 01:45 AM
RE: Rock64 Power Supply Polarity - by xalius - 12-18-2017, 08:30 AM
RE: Rock64 Power Supply Polarity - by dkryder - 12-18-2017, 09:33 AM
RE: Rock64 Power Supply Polarity - by nmhart322 - 12-18-2017, 10:57 AM
RE: Rock64 Power Supply Polarity - by Lamensis - 12-18-2017, 11:57 AM
RE: Rock64 Power Supply Polarity - by NablaMetal - 05-26-2018, 07:15 AM
RE: Rock64 Power Supply Polarity - by evilbunny - 05-26-2018, 03:40 PM
RE: Rock64 Power Supply Polarity - by pfeerick - 05-26-2018, 04:56 PM
RE: Rock64 Power Supply Polarity - by NablaMetal - 05-27-2018, 05:23 AM
RE: Rock64 Power Supply Polarity - by NablaMetal - 05-29-2018, 01:13 AM

Possibly Related Threads…
Thread Author Replies Views Last Post
  lost eletronic component rock64 marvin1986 1 190 06-01-2021, 06:27 PM
Last Post: 8bit
Shocked Rock64 - Reboots after few minutes addezai 2 298 04-22-2021, 07:03 PM
Last Post: addezai
  Python GPIO Library for the Rock64 (R64.GPIO) Leapo 36 36,777 04-17-2021, 08:59 AM
Last Post: theophile
Question Hardware issues with Rock64 grobbs 10 1,211 04-08-2021, 05:24 AM
Last Post: t4_4t
  Rock64 Long Term stability ramprasad 4 1,673 03-16-2021, 07:23 PM
Last Post: Rocklobster
  Rock64 No Audio - Solved wbecks 11 14,883 03-15-2021, 03:15 PM
Last Post: lowry
  Safest way to send shutdown signal to headless Rock64 SMB server? bmurphr1 3 1,012 03-14-2021, 06:01 PM
Last Post: clach04
  Rock64 as a router (OpenWRT,etc) bob-anon 2 1,553 03-12-2021, 01:16 AM
Last Post: arkadione
  Rock64 enable 1-wire to read DS18B20 or Dallas temperature sensor Perry 2 1,165 02-12-2021, 08:02 PM
Last Post: Perry
  Will Mobian Run On Rock64? Porcupine 1 577 01-13-2021, 12:39 PM
Last Post: tophneal

Forum Jump:


Users browsing this thread: 1 Guest(s)