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Thread: Pitastic

  1. #81
    Senior Member kidstypike's Avatar
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    Quote Originally Posted by Man in a van View Post
    Just made another investment
    You're a nut!
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  2. #82
    Senior Member kidstypike's Avatar
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    But seriously, these are good.

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    Server - LMS 7.9.2 Pi4B 4GB/pCP 6.0.0 18K library, playlists & LMS cache on SSD (ntfs)
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  3. #83
    Senior Member chill's Avatar
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    Quote Originally Posted by kidstypike View Post
    But seriously, these are good.
    Agreed. I needed a case for my spare 4B 1GB, so I ordered one of these on the strength of your earlier post. It arrived this morning. I paid ú1 more and got the version with an SD card reader and a 3A power supply :-)

    I ran the same oggenc job that took my amplifier-mounted 4B 4GB up to 57 degrees.



    Wired for 5V the fan is impressively quiet, but I wired it for 3.3V, and it's effectively inaudible - I can only hear it if I put it close to my ear. Not that I need it, but I'm now toying with the idea of mounting such a fan over my amplifier's 4B, since it's so completely quiet.

  4. #84
    Senior Member chill's Avatar
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    I made a mount for the fan, to hopefully slot in between my RPi and my button board.





    Here it's slotted into a mockup, over a 3B+


    I may have to adjust the standoff heights to make sure nothing clashes.

  5. #85
    Senior Member kidstypike's Avatar
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    Quote Originally Posted by chill View Post
    I made a mount for the fan, to hopefully slot in between my RPi and my button board.





    Here it's slotted into a mockup, over a 3B+


    I may have to adjust the standoff heights to make sure nothing clashes.
    But you'll need good ventilation into and out of your amp, no good just blowing hot air onto the Pi4 CPU?
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  6. #86
    Senior Member chill's Avatar
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    Quote Originally Posted by kidstypike View Post
    But you'll need good ventilation into and out of your amp, no good just blowing hot air onto the Pi4 CPU?
    That's true, and it has. The baseplate has a grid of mounting holes:


    And the top plate has ventilation slots right above where I've mounted the RPi:


    And the front and back plates don't seal against the baseplate. So plenty of ventilation.

    I've now added the fan to the RPi4 in the amp, and I'm waiting for the amp to warm up to see what effect the fan has. This is more out of curiosity than need, and I've left the fan's power connection accessible so that I can disconnect it easily.

  7. #87
    Senior Member chill's Avatar
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    The amp got up to operating temperature, and I connected the fan at 14:16. It seems to drop the temperature by ~5 degrees. I'm guessing it's no greater because it's mostly just moving warm air around inside the amplifier, as kidstypike suggested. The fan's not really big enough, nor suitably ducted, to draw in fresh air. I don't think it's worth the effort.




  8. #88
    Senior Member chill's Avatar
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    Quote Originally Posted by Greg Erskine View Post
    I wonder, as the CPU is practically doing nothing, it is probably throttled back to 600MHz most of the time. The periods of increased speed are so short it is not captured by temperature sampling period.
    Sorry Greg - I missed this.

    I'm not so sure about that. You can apparently show the current CPU frequency with:
    Code:
    sudo cat /sys/devices/system/cpu/cpu0/cpufreq/cpuinfo_cur_freq
    On my RPi4, running pCP (LMS & Squeezelite) I've never seen it show anything but the currently set maximum. So apparently there's a difference, certainly in terms of heat generation, between an idling CPU @1500MHz and one under load at the same frequency. Or maybe that command isn't doing what I think it is - that might explain why I never saw it report a different frequency when I briefly played with the governor settings in the tweaks menu.

  9. #89
    Senior Member kidstypike's Avatar
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    Software changes?

    Just noticed this.

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    Server - LMS 7.9.2 Pi4B 4GB/pCP 6.0.0 18K library, playlists & LMS cache on SSD (ntfs)
    Study - Pi3B+/pCP 5.0.0/pi screen/HiFiBerry DAC+/jivelite,
    Lounge - Pi2/pCP 5.0.0 > HiFiBerry DIGI+ > AudioEngine DAC1 > AVI DM5
    Dining Room - Squeezebox Boom
    Garage - Pi3B/Pi screen/HiFiBerry DAC+/pCP 5.0.0 > Edifier R980T

    Spares - 2xTouch, 1xSB3, 1xRadio, 6xRPi

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