[arm-allstar] 13 V to 5V PI pwr supply

[petem001 at gmail.com]

If my memory is right, using a linear regulator after a switching power supply is not a good thing..



From: James R. Pilgram 
Sent: Tuesday, October 13, 2015 5:45 AM
To: arm-allstar at hamvoip.org 
Subject: Re: [arm-allstar] 13 V to 5V PI pwr supply

Tonight I was setting up a Raspberry Pi2 with a simplex CDM750 and converted usb fob getting all kinds of screwy problems. The Fob was going in and out and failing. 

In my case, I was using a Astron SS-25 switching power supply to power the radio and one of the 12 to 5 volt switching modules to power the Pi. The radio was going crazy, the fob was going crazy, the Pi was going crazy and the supply crow-barred. I grabbed another supply, A Samlex SEC1223 switching supply and got the same issues. We were having a similar issue with another node on Maui only he was using a DMK-URI and a switching supply Powering a 12 to 5 volt module and a simplex radio from the same supply. 

Turns out the guy on Maui solved the problem with a different power supply for the Pi not hooked to the switching supply running his radio. I'll be trying again tomorrow with a linear supply. I never had a problem with a linear supply or a nice big battery bank. 

Jim NH6HI 


On 10/10/15 03:47, REDBUTTON_CTRL wrote:

  Well, how are you running them on a 12v battery or 13.8 power supply with battery back up? 
  Are they at home or at repeater site?
  Jon VA3RQ

  On 10/9/2015 1:13 AM, Eric Harrison wrote: 
          Well not much more I can say. They are made in China and are cheap and like all electronics are subject to failure's! 

          Eric

          N7JYS


          Sent from Yahoo Mail on Android


----------------------------------------------------------------------
                From:"David McGough" mailto:kb4fxc at inttek.net
                Date:Thu, Oct 8, 2015 at 11:35 PM
                Subject:Re: [arm-allstar] 13 V to 5V PI pwr supply



                Hi Eric,

                Interesting that you're having failures. I'd like to hear more about the 
                failed systems?

                I've been running -many- (more than a dozen at this point) supplies of
                this style, on many projects, with no failures.

                73, David KB4FXC


                On Thu, 8 Oct 2015, Eric Harrison wrote:

                > Just FYI I have been using this same DC to DC converter on several up my pi's and already had 2 of them fail after a few months of use.


                Eric

                N7JYS

                Sent from Yahoo Mail on Android

                From:"jim.pilgram at gmail.com" <jim.pilgram at gmail.com>
                Date:Thu, Oct 8, 2015 at 7:25 PM
                Subject:Re: [arm-allstar] 13 V to 5V PI pwr supply

                I have been using these on our system since Doug put the RP2 build out and have not had any problems with the over 1 dozen units out there. Love them and the price. 


                Sent from my BlackBerry 10 smartphone on the Verizon Wireless 4G LTE network.

                From: Jacques St-Pierre

                Sent: Thursday, October 8, 2015 14:12

                To: arm-allstar at hamvoip.org

                Reply To: ARM Allstar

                Subject: [arm-allstar] 13 V to 5V PI pwr supply


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