Engineering and technology notes

Raspberry Pi • View topic – Poor audio quality on analog output

Jovan Stosic February 24, 2017

Hi all, I’m having problems with the audio on the analog output and for my project I can’t use the HDMI audio. As I am using the Pi to play a live audio stream I don;t have a problem with the ‘popping’ between tracks that has been described, my issue is with the general poor audio quality and background noise that is always present (if there is silence or low audio playing). I am using omxplayer to play the live feed, I have noticed that the + and – do not seem to work to alter the levels at all, I woul

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Raspberry Pi • View topic – Power for an external HDD

Jovan Stosic February 24, 2017

I have the Raspberry Pi Model B with its original power adapter (1A). If I connect a USB external drive to it, the drive tries to start spinning but it won’t, and the Raspberry Pi does not detect it. If I connect it using a Y USB cable (1 USB for data + power and the second USB only for power), the Raspberry Pi restarts and the drive does not start spinning anyway. If I use the Y USB cable, but connect the data + power to the Raspberry Pi and the second USB (power only) to an external USB adapter (from a

Source: Raspberry Pi • View topic – Power for an external HDD

John William Strutt, 3rd Baron Rayleigh

Jovan Stosic February 23, 2017

John William Strutt, 3rd Baron Rayleigh OM PRS (/ˈreɪli/; 12 November 1842 – 30 June 1919) was a physicist who, with William Ramsay, discovered argon, an achievement for which he earned the Nobel Prize for Physics in 1904. He also discovered the phenomenon now called Rayleigh scattering, which can be used to explain why the sky is blue, and predicted the existence of the surface waves now known as Rayleigh waves. Rayleigh’s textbook, The Theory of Sound, is still referred to by acoustic engineers today.

Source: John William Strutt, 3rd Baron Rayleigh – Wikipedia