HI,
as one of the early birds I'm proud owner of a HifiBerry Amp 0.9 (beta testing)
As live goes on, I now found the time to start my little amp project.
The amp was running fine with a 12 V 5A power supply, happily powering the raspi.
Now I wanted to connect 2 speakers and to find out which +/- left/right cable would be the right one I searched the whole internet (it's wireless!) and didn't find any reliable documentation.
Amp hardware version 0.9 does not come up with 'text' on the board to make clean what cable goes where.
So i decided to unplug the amp from the raspi in the hope there is some text on the bottom. nada.
Since I found nothing I decided to browse google images until I found a picture hifiberry amp where 'left/right' and '+/-' where readable on the circuit board.
I replugged the amp to the raspi, connected the speaker cables ( + left - / + right - ) and replugged the power.
Nothing happened. The raspi not even showed a power led, so I measured the GPIO pins against ground and there was no voltage anywhere. The powersupply is fine, I can measure the 12 volts at the connector pins on the amp. But anywhere else: nothing.
Is there anything I can do ? Is this a 'beta version 0.9' issue ?
sniff...
Peter
Date
Votes
9 comments
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HiFiBerry team Hi Peter,
do I understand this correctly. The system powered up without problem as long as no speakers were connected, but now it does not work anymore?
Do you have any external devices connected to USB?
Best regards
Daniel -
Peter Marquardt Hi Daniel,
Yes, that's correct. Even without raspi there is no voltage above 0.7 V measurable on the bottom othe circuit board (with 12.6 V @ power-connector).
It was working fine before, with an unpowerd USB-Hub connected. Connected were: USB-Keyboard and an IcyBox USB-SATA with an 1 TB Seagate 2,5" Laptop SSHD. So the Powersupply of the HifiberryAmp was also powering the HDD and the keyboard. This worked out fine without speakers attached. I used this setup to install the raspi.
As far as I remember, I powered up the hifiberryamp/raspi with the speakers but _without_ the usb-devices attached for a 'quick' check. This already failed.
I find a SMD fuse (?) F301 near the power connector. Maybe this one went to electronic heaven ?
Peter -
HiFiBerry team Hi Peter,
yes, this could be the problem. We had some problems with these fuses as they blew to fast. This has been changed in the production version. There are 2 options:
- you send it to us and we will replace it
- you de-solder the fuse and replace it by a short cable (there is no need for the fuse).
What is better for you?
Best regards
Daniel -
Peter Marquardt Hi Daniel,
I'll take option 2, so I'll heat up our JBC soldering station and defuse the fuse 8-)
Thanks for your support.
Peter -
HiFiBerry team Ok, let me know if you need any help.
Best regards
Daniel -
Peter Marquardt fuse defused, unsoldered, bridged, raspi has power. works!
Thanks!
Peter -
HiFiBerry team Glad to hear this :-)
Best regards
Daniel -
Peter Marquardt ... and the amp work great!
driving 2 Magnat Monitor Supreme 100 speakers like a charm.
archlinux / mpd / ympd
Thanks for your patient support Daniel, afterwards I found I should have read the beta-tester forum, but these pages are hard to find 8-)
Cheers,
Peter -
Peter Marquardt ... and the amp work great!
driving 2 Magnat Monitor Supreme 100 speakers like a charm.
archlinux / mpd / ympd
Thanks for your patient support Daniel, afterwards I found I should have read the beta-tester forum, but these pages are hard to find 8-)
Cheers,
Peter
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