You do not have permission to edit this page, for the following reason:
The action you have requested is limited to users in one of the groups: Users, Automoderated Users.
To edit this page, please answer the question that appears below (more info):
What is another name for something neuroscientists would colloquially call a spike?
Datasheet as PDF uploaded to wiki
URL to a datasheet that is an external page
Free text:
The HiFiBerry Amp 2 is an integrated [[Is Part Type::Amplifier]] and [[Is Computer Card Type::Sound Card]] [[Raspberry Pi HATs|HAT]] for the [[Raspberry Pi]] capable of playing audio at [[Has Bit Depth::24]] bits/[[Has Max Sampling Rate::192000|192kHz]]. The Amplifier chip used is [[Uses Part::TAS5756M]] == Output Filtering == '''WARNING:''' while the part is rated up to 192kHz, there seems to be a low-pass filter applied to the amplifier to filter above 20kHz, see here: https://support.hifiberry.com/hc/en-us/community/posts/360014295118-Ultrasonic-frequency-response?mobile_site=true Efforts to bypass the filter are ongoing. It should be possible to reconfigure the filter if it is a DSP filter, or remove the components if it is a hardware filter. According to the datasheet ( {{#show: TAS5756M | ? Has Datasheet=}} , page 60) the amplifier is commonly used with a passive LC lowpass filter. Looking at the board, it seems as if the large black components next to the speaker output are the inductors, and the capacitors on either side are the other components in the filter. The datasheet discusses a filterless mode, so it should be possible to bypass the filter by removing those components and shorting the pads on either side of the inductor. == Configuration == Note that the following is encapsulated in the autopilot script ''[[Depends on::Scripts:hifiberry]]'', which can be executed with <pre>python -m autopilot.setup.run_script hifiberry</pre> === Device Tree === In '''/boot/config.txt''', remove or comment out the following to disable the built-in audio<ref>https://www.hifiberry.com/docs/software/configuring-linux-3-18-x/</ref>: <pre>dtparam=audio=on</pre> And add the line: <pre>dtoverlay=hifiberry-dacplus</pre> === ALSA === Optionally, you can make the card the default sound-card for ALSA by creating a ''/etc/asound.conf'' file with the following <pre> pcm.!default { type hw card 0 } ctl.!default { type hw card 0 } </pre> == Troubleshooting == See [[Troubleshooting Sound]] Most common: * Check you're not using any of the reserved pins * Make sure that pin 7 is in your <code>PULLUPS</code> pref * Check that your <code>OUTCHANNELS</code> pref is set to the correct channel that you are outputting to * Ensure that the <code>AUDIOSERVER</code> is set to <code>true</code> == GPIO Usage == The following pins are reserved and can't be used for other purposes<ref>https://www.hifiberry.com/docs/hardware/gpio-usage-of-hifiberry-boards/</ref>: {| class="wikitable" ! Board Pins !! BCM # !! Use |- | 3, 5 || 2, 3 || I2C Configuration |- | 12, 35, 38, 40 || 18-21 || Sound interface |- | 7 || 4 || Mute -- pulling low mutes (so pull it up!) |} == Specs == Recommend powering with an 18V power supply! {| class="wikitable" |Recommended operating voltage || 12-20V || |- |Absolute maximum operating voltage||24V|| |- |Maximum output power||60W|| |- |THD+N||<0.02%||typical, output power 0.1-10W |- |SNR||104db||typical |- |Frequency response||20-20000Hz||output filter characteristics depending on specific speaker parameters |- |Typical output power per channel||14W||Vsupply=12V, Rspk = 4Ohm, THD+N <0.1% |- |||18W||Vsupply=18V, Rspk = 4Ohm, THD+N <0.1% |- |||20W||Vsupply=24V, Rspk = 4Ohm, THD+N <0.1% |- |||8W||Vsupply=12V, Rspk = 8Ohm, THD+N <0.1% |- |||17W||Vsupply=18V, Rspk = 8Ohm, THD+N <0.1% |- |||28W||Vsupply=24V, Rspk = 8Ohm, THD+N <0.1% |- |Maximum output power per channel||15W||Vsupply=12V, Rspk = 4Ohm, THD+N <10% |- |||30W||Vsupply=18V, Rspk = 4Ohm, THD+N <10% |- |||44W||Vsupply=24V, Rspk = 4Ohm, THD+N <10% |- |||10W||Vsupply=12V, Rspk = 8Ohm, THD+N <10% |- |||20W||Vsupply=18V, Rspk = 8Ohm, THD+N <10% |- |||38W||Vsupply=24V, Rspk = 8Ohm, THD+N <10% |- |Sample rates||44.1-192kHz|| |} {{#set: Has Description=An integrated DAC and Amplifier for the Raspberry Pi }} {{Special:Contributors/HiFiBerry_Amp2}} [[Category:RaspiOS]] [[Category:Configuration]]
Summary:
This is a minor edit Watch this page
Cancel