zapzapouch

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zapzapouch

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  • 06.27.2012
  • Fundamentals of USB Audio
  • Microsoft is (finally) adding support for USB Audio 2.0 in Windows 10. "As you have found out, we have an initial version of a USB Audio 2 driver in the latest Windows Insider release!" http://answers.microsoft.com/en-us/insider/forum/insider_wintp-insider_devices/windows-support-for-usb-audio-20/0d633b9f-3193-4c63-8654-fb10b3614a04?page=19
  • 08.19.2004
  • Dual-voltage regulator meets USB-power needs
  • I don't think this circuit works if you are drawing any current from VBUS. If the load on the "5V" terminal is 50 ohm, for instance (drawing the standard unit load of 100 mA at startup), then the "5V" output never rises above the divided voltage of 2.5 V, so the 2N3906 never turns off, and the Si2335 never turns on.
  • 06.27.2012
  • Fundamentals of USB Audio
  • ... Because it doesn't? And never has? http://answers.microsoft.com/en-us/insider/forum/insider_wintp-insider_devices/windows-support-for-usb-audio-20/0d633b9f-3193-4c63-8654-fb10b3614a04
  • 01.10.2007
  • Design of High-Performance Balanced Audio Interfaces - Part 4
  • Graeme - Applications of Operational Amplifiers 3rd-Generation Techniques from 1973 has the same circuit for cancelling out common-mode noise in instrumentation amps, except the feedback amplifier is open-loop and inverting. So is that part of the circuit not patented then? Before that, he suggests a FLOATING power supply so that the entire instrumentation amp tracks the common-mode voltage!
  • 01.10.2007
  • Design of High-Performance Balanced Audio Interfaces - Part 4
  • "To ac common-mode voltages, the circuit's input impedances are 1000 or more times the values of R1 and R2, but to differential signals, R1 and R2 have their normal values, making the signal input impedance R1 + R2." Isn't this the opposite of what you want? The common-mode impedance should be low to bring the common-mode voltage within range of the op-amp so it can be cancelled out, while the differential impedance should be very high, to avoid degrading the signal. The whole point of the instrumentation amp is to get a very high input impedance.
  • 03.18.2014
  • Neil Young: Say Yes to 24-bit/192-kHz audio
  • The Frey effect is not "hearing microwave frequencies". It's literally hearing microwaves. As in radio waves, not acoustic waves. The microwaves are heating the insides of your ears, which produces a demodulated clicking sound at audible frequencies. You aren't hearing microwave frequencies. Humans can not hear any frequencies above 20 kHz, and trying to play them back on speakers *degrades* the sound through intermodulation distortion. Yes, you can hear a difference, because the 192 kHz version is WORSE.