skrodahl wrote:I see a lot of cool stuff there. You got the power button
. Which color is it? I got all red/blue/yellow, and I just love the yellow one. I can see the ALPS pot, and there's a relay board as well. Anything else you'd like to point out?
Got the blue button, but also liked the yellow or green as well so may have to get all three to make a final choice !
One thing I didn't realise is that the button remains depressed when the switch is on
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The project is to make a stand alone Rune music player ...... just add power and speakers !
Just love it when a plan comes together, a photo of the bench testing should help ....
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The project is powered by a 19V 4.5A laptop power supply, this powers the Audiobah amp @ 19v and also powers a little board that drops the 19v to 5v to power the Pi and Router.
As I am planning to place this all in an "optimistically small" chassis, I didn't want to use a powered hub so sourced a small NAS wireless router (the little black box) to connect a 2.5" SATA drive FLAC music library and to also provide the network to interface the iPad Rune UI. Unfortunately the old SATA drive I have seems to require more that the 1.2A @ 5v the router supports.
As anyone tried to power a 2.5" drive on the Pi with one of the dual USB cables that will provide power to the drive from 2 USB ports ?
The other option is to source an SSD drive, the Samsung 840 EVO seems to be reasonably power conservative at 0.6A @ 5V so that may help. In the interim a USB stick will provide the data source. The small white router is an alternative if I manage to drive the disk/SSD directly from the Pi ......with shipping from China generally longer than my patience threshold I ordered it just in case !
The RCA connection is only temp, I am still waiting on some right angle 2.54 3P connectors to attach to the HifiBerry directly then I will remove the RCA connectors from the board.
The initial set-up went well using Rune Audio Alpha 0.3, you guy's are just sensational with this App, just love it thank you !!!
All worked as planned, just one little annoying issue that is a small hum/scratching sound with no music playing, that only marginally increases with increased volume. The sound changes with Pi activity !
So far have identified after much testing:
1. If the Pi is powered from another power source the noise goes away
2. If the RCA connectors are disconnected the sound goes away
3. if I connect the ground (a mounting hole) on the AMP to the metal surround of the USB or LAN connectors on the Pi the noise reduces but is not fully eliminated and to a lesser degree from the Pi to the small power board
This has me thinking I have a grounding issue ? ....... any thoughts ?
I am still a little concerned that the power supply (19v @ 4.5A) may not be adequate especially when the drive is attached, but we will see.
Other than the small amount of noise with no music playing it is all been working well for the last couple of hours and the sound out of the Audiobah/Pi/Berry combination is pretty sweet considering the investment !
The relay board was also a just in case I was going to have a second input source, but this is a future consideration/option