[arm-allstar] Reboot after few minutes

Sat Mar 9 09:29:20 EST 2019

Hi Dennis,

I use the 5V3A epoxy filled, rectangular DC-DC converters too.  In
general, that's plenty of power and they work great. I purchase the leaded
version and solder the leads directly to the RPi3b PC boards. This results
in virtually no detectable voltage drop.  All my installations were setup
this way (over a dozen).

Now for the serious down side. Over the last 2 years, I've had a couple of
these DC-DC converters fail.  Doug and George have even seen even more
failures. There is also significant variation in "quality" with devices
from different sources. Not good.

Just like Doug & George, I've now also switched to using non-potted
variety of DC-DC converters for most new installations or for replacements. 
I also use boards similar to those from Amazon, below. I've had none of 
these boards fail, so far.

Applicable morals here:

....Live and learn.

....Don't let a bulk manufacturer hide poor build quality in an epoxy 
blob!

73, David KB4FXC

On Sat, 9 Mar 2019, "Dennis Ramos via ARM-allstar" wrote:

> Hi tony, you are definitely right, since rpi b+ come out I change all 
my rpi power supply to dc to dc buck converter, can handle up to 3amp, 
still have an small voltage drop from 500mA to 1.5A have 300mV to 500mV 
is not bad. That why Iâ€™m a bit confident is not the power supply, but 
fellows says check it again, or reinstall, so....

Best regards and thanks again to you David and Doug, so far so good.

De Dennis/m0tfg

Sent from my iPad

> On 9 Mar 2019, at 06:25, Doug Crompton via ARM-allstar <arm-allstar at hamvoip.org> wrote:
> 
> Tony,
> 
> Agreed. The problem with the car adapters is two fold. One is that they
> are a non-adjustable fixed voltage output and right at or slightly less
> than 5V at load. When you go through the reverse voltage protector and the
> polyfuse on the Pi 3B+ the voltage could drop to lower than the trip point
> for low voltage detect. The other problem is reliability. We have seen
> several failures but there are so many Chinese sellers it is hard to figure
> which ones are good and which ones are not. There is also no way to tell
> exactly what is inside. There is no way to remove the epoxy. There are so
> hard even cutting them in a band saw is difficult to do and doesn't really
> tell you anything. I use wall warts here mostly bought from Microcenter for
> the Pi. If I was going to use a discrete supply I would go for one of the
> open board buck converters with adjustable output rated at 3A. Use a
> digital meter to set it to 5.2V when plugging into the .
> 
> Here is an example of the open board -
> 
> https://www.amazon.com/eBoot-Converter-Voltage-Adjustable-Step-up/dp/B06XWSV89D/ref=pd_sim_23_3/131-3949763-5412550
> 
> And a fancy one with a readout for voltage in and out and current -
> 
> https://www.amazon.com/Converter-DROK-Buck-Boost-Adjustable-Regulator/dp/B0789QVKKF/ref=pd_day0_hl_23_3/131-3949763-5412550
> 
> 
> *73 Doug*
> 
> *WA3DSP*
> 
> *http://www.crompton.com/hamradio <http://www.crompton.com/hamradio>*
> 
> On Sat, Mar 9, 2019 at 1:02 AM "Tony Ross via ARM-allstar" <
> arm-allstar at hamvoip.org> wrote:
> 
>> 5V is one thing, sufficient amperage is another ... we need both, as
>> it's a very common electrical problem. Usually >2.1A on an RPi is
>> sufficient, unless greater current is needed for USB devices in which
>> case a powered USB hub comes in useful.
>> 
>>> On 3/8/19 8:11 AM, "Dennis Ramos via ARM-allstar" wrote:
>>> Hi David, Seems it is regularly, I powered it on gpio pin with 5v, using
>> dc to dc, buck converter from 12v.
>>> 
>>> On the log, just the normal sending registration for node....
>>> Then suddenly it reboots, I have dvswitch apps connected locally, it
>> beeps once it already disconnected.
>>> 
>>> Regards
>>> 
>>> Dennis
>>> 
>>> Sent from my iPad
>>> 
>>>> On 8 Mar 2019, at 15:56, Doug Crompton via ARM-allstar <
>> arm-allstar at hamvoip.org> wrote:
>>>> 
>>>> Well obviously that is not normal and I would have no idea what is
>> going on
>>>> either without some more information.
>>>> 
>>>> What are the lights on the Pi doing when this happens?
>>>> 
>>>> If you login to the Linux prompt are you getting any messages?
>>>> 
>>>> What Pi version? Has it been updated?
>>>> 
>>>> Any other information you can give would be helpful.
>>>> 
>>>> 
>>>> *73 Doug*
>>>> 
>>>> *WA3DSP*
>>>> 
>>>> *http://www.crompton.com/hamradio <http://www.crompton.com/hamradio>*
>>>> 
>>>> On Fri, Mar 8, 2019 at 10:46 AM "Dennis Ramos via ARM-allstar" <
>>>> arm-allstar at hamvoip.org> wrote:
>>>> 
>>>>> Hello guys, just wonder if you help me with my allstar, I just notice
>> that
>>>>> the server rebooted itself after a few minutes. I have no idea what is
>>>>> going on.
>>>>> 
>>>>> Any help is highly appreciated
>>>>> 
>>>>> 73 de m0tfg
>>>>> 
>>>>> 
>>>>> Sent from my iPad
>>>>> _______________________________________________
>>>>> 
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>>>>> 
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>>>>> 
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>> 
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