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New Take On Hi-res Portable (and Pi Power)

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    #16
    Originally posted by mooblie View Post
    May I ask (to anyone doing this):

    a) what capacity powerbank (mAh)?
    b) roughly what duration of portable playback do you get from a full charge?

    Thanks in advance!

    Well, mine are all old Anker units, 10000mAH (max output 3.0 amps).

    It has two 5 Volt outputs but the both don't supply 3 amps each

    So I would say you want 5 volts at 3 amps through at least one output, as the current draw is often greater at power on.

    I have some older ones which allow "pass through" which means they can be charged at the same time they are being used.

    Non are modern enought to have "Smart" connections so I don't know if that feature will be a help or hindrance.

    Length of use depends on volume and workload put upon the rapberry pi, also the impedance of the headphones. (that's a techie as I get )

    Are you near to Dingwall at all ?

    ronnie

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      #17
      Originally posted by mooblie View Post
      May I ask (to anyone doing this):

      a) what capacity powerbank (mAh)?
      b) roughly what duration of portable playback do you get from a full charge?

      Thanks in advance!
      I use an Anker 20100 which Amazon say can supply up to 4.8A. It has four blue leds indicating the state of charge. I tend to recharge mine when it gets down to 2 leds showing. Can't say how long it would run till the battery was flat, haven't tried using that way. I did buy my (very short) USB lead from Anker, no use having a cheap, longer than needed USB lead absorbing some of the power.
      Last edited by ; 2021-08-22, 08:51. Reason: Grammar correction

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        #18
        Originally posted by d6jg View Post
        Here is mine sans headphones
        Neat. Guess the battery usage is somewhat lower with the Pi Zero W.

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          #19
          Originally posted by d6jg View Post
          The Khadas Tone Board is an incredibly good DAC for its price but decent cases are difficult to find. The best one I found was Audiophonics
          Thanks for the responses on the Khadas Tone Board.

          I have other projects on the go at the moment and don't have the time to devote to following this up.

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            #20
            Pi Zero WH with 1.3" display. A work in progress, using LMSTools python lib. Joystick for <<,>>,Pause/Play,Volume +/-.
            Apple USB-C headphone dongle with adapter. Waiting for battery HAT...

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            piTouch™ w/JustBoom DigiHat -> RME ADI-2 DAC FS -> JBL 305P MkII monitors; LMS 8.2 on piCorePlayer/Pi 4; Material Skin.

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              #21
              Originally posted by chicks View Post
              Pi Zero WH with 1.3" display. A work in progress, using LMSTools python lib. Joystick for <<,>>,Pause/Play,Volume +/-.
              Apple USB-C headphone dongle with adapter. Waiting for battery HAT...

              [ATTACH]35590[/ATTACH]
              Neat !!

              Would it be possible for you to knock up a simple "how-to" when you have time, please.

              The Apple dongle is a bargain at £9 delivered, I have a couple, and thanks to paul- they work on pCP

              ronnie

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                #22


                My latest portable but HiFi quality player.
                Pi Zero W with pCP velcroed onto a Getihu power bank with Audioquest Dragonfly. I’ve been using it for about 6 hours so far and it’s used just 4% of the power. Started at 83%.
                It fits into a small carry case. The power bank has an on/off switch and 2 USB out with separate USB-C that is both in and out.

                No screen required as it’s controlled by my phone. Why not just use the phone? Both iPhone and Android carry compromises.

                iOS. iPeng will play 24/96 happily with the Dragonfly attached but you need to use a Lightning to USB adapter. I’ve tried all sorts but the one constant is that they fail after a period of use. They require an Apple authorised chip in the Lightning end and it’s this that is the weak area. Also iPeng doesn’t support crossfade.

                Android. Although the Android audio subsystem can handle 24/192 neither of the existing SB player apps seem to be able to use it beyond 16/48. Correct me if I’m wrong.


                Sent from my iPhone using Tapatalk
                Jim
                https://jukeradio.double6.net


                VB2.4 storage QNAP TS419p (NFS)
                Living Room Joggler & Pi4/Khadas -> Onkyo TXNR686 -> Celestion F20s
                Office Joggler & Pi3 -> Denon RCD N8 -> Celestion F10s
                Dining Room SB Radio
                Bedroom (Bedside) Pi Zero+DAC ->ToppingTP21 ->AKG Headphones
                Bedroom (TV) & Bathroom SB Touch ->Denon AVR ->Mordaunt Short M10s + Kef ceiling speakers
                Guest Room Joggler > Topping Amp -> Wharfedale Modus Cubes

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                  #23
                  Originally posted by chicks View Post
                  Pi Zero WH with 1.3" display. A work in progress, using LMSTools python lib. Joystick for <<,>>,Pause/Play,Volume +/-.
                  Apple USB-C headphone dongle with adapter. Waiting for battery HAT...

                  [ATTACH]35590[/ATTACH]
                  Well, the battery HAT never arrived from China, so went another direction, using a case and battery meant for gamers. Fun little project, if impractical. Haven't tested the battery duration, but expect an hour or two before it has to go back on charge. A magnetic micro-usb charger cable would make it a tiny bit more practical. No output at the moment, just a simple controller. The joystick is pretty nifty to use with the cap on.

                  It doesn’t take a crack market analyst to surmise that the entire point of handheld video game consoles is portability. Some, like the…


                  Click image for larger version

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                  piTouch™ w/JustBoom DigiHat -> RME ADI-2 DAC FS -> JBL 305P MkII monitors; LMS 8.2 on piCorePlayer/Pi 4; Material Skin.

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