TIs Opamps OPA165x great, probably better OPA1611 recommended https://www.diyaudio.com/community/threads/choosing-of-best-sounding-op-amps-for-the-lowest-possible-thd-n-really-the-best-way.367692/ https://www.ti.com/de-de/amplifier-circuit/op-amps/audio/products.html

https://de.wikipedia.org/wiki/I%C2%B2S Unbedingt den PCM2706C oder PCM2707C (auf DigiKey nicht verfügbar) von TI nehmen (C ist wichtig, PJT folgt immer, ob R(eel) oder nicht ist egal) Die anderen (insbesondere PCM290x) haben kein I²S Unterschied zwischen C und nicht C Chips: https://www.ti.com/lit/an/sbfa019/sbfa019.pdf

andere chips: CM6635 (mouser, wie im schiit hel), CP2615 (24bit 48k discontinued), CS8412, CS8416 (mouser) Gibt es Alternativen von Cirrus Logic? http://3.bp.blogspot.com/-GhfnEOvmYFY/UG3X19q91BI/AAAAAAAAAgU/z2ZkhkYbzWM/s1600/i2s_interface.jpg

dac chips:

PCM1753
PCM1754
PCM1755
PCM1780
PCM1781
PCM1782
CS4344

https://www.headphonesty.com/headphone-power-calculator/

@120dB: max power: Audeze LCD-3 - 1315mWrms max voltage: Beyerdynamic DT770 PRO - 12.59Vrms max current: Audeze LCD-3 - 165.5mArms

@110dB: max power: Audeze LCD-3 - 132mWrms max voltage: Beyerdynamic DT770 PRO - 4Vrms max current: Audeze LCD-3 - 52.4mArms

overcurrent chip: https://www.digikey.de/de/products/detail/richtek-usa-inc/RT1720GF/6002895 overcurrent circuit: https://forum.allaboutcircuits.com/threads/current-limiting-circuit.170070/ https://electronics.stackexchange.com/questions/200716/current-limiting-with-mosfet

https://hackaday.com/2013/08/27/building-a-high-end-usb-audio-dac/

helpful: caps should be tht (especially dc blocking -> film), for resistors it doesn't matter (except output emitters) https://www.youtube.com/watch?v=4ZUBda5oIUo not so helpful: https://www.youtube.com/watch?v=iJazCWnAmkM

helpful: for dc blocking and even power: use good film cap with large electrolytic in parallel (do they have to be dual polarity for dc block???) (0.1-0.2uF for power rails| could this be biased, because no lower value cap was paralleled beforehand?) https://www.youtube.com/watch?v=mCk50RTtrT0 https://www.youtube.com/watch?v=FQOWd-mObFQ

helpful: eevblog multiple caps (especially results at 80% time, multiple can make it worse, check bode plots for all (power) caps) https://www.youtube.com/watch?v=BcJ6UdDx1vg

Switchmode? https://www.youtube.com/watch?v=p0fJSaVljeg

good precision current source: https://sound-au.com/ism.htm

TO WATCH/READ:

https://www.youtube.com/watch?v=PkJqE-EsoWY
how to design front panels: https://www.youtube.com/watch?v=wg_J9WElvBY

TO BUY:

case: Hammond 1455N1601BK (02 variant has no separate face plate)
USB C extender
isolation heat pads !!!!!!!!!!!!!!!!!! (and check heat sink footprint)
nylon isolators for screws
gold screws for panels -> see https://www.youtube.com/watch?v=wg_J9WElvBY @ 5:05
screw size for 1455N1602BK
- original: 1455MS100
- screw length: 9.5mm == 0.375" == 15/32"
- screw diameter: M3.5 == 3.5mm == 0.138" == 9/64" == #6
- thread per inch: 32 (e.g #6-32)
USB to I²S chips
audio dacs
output resistors
output transistors
vas transistors
input transistors
0 ohm smd resistors
collection of different smd resistors
power caps
film caps for dc blocking and power supply
ceramic caps (smd?? closest to output transistors, miller compensation)
button with rgb light for power button and status
transformer
FUUULLL BRIDGE RECTIFIAAA!
power jack