Free Elektor Article: Card Sound

Free Elektor Article: Card Sound

With a smartphone or an MP3 player it’s easy to play audio files, but generally not at room strength or if you can, only in wretched quality. The Card Sound project makes it possible to fill the room with music and have excellent sound reproduction! This lightweight and compact player also stands out for its modest quiescent current consumption and desirable extra features such as I²C and RS-485 control.

Quick Features:

  • Analogue/digital supply voltages: 3 to 18 VDC / 4.5 to 12 VDC
  • Analogue/digital current requirements: see Measurements panel
  • Sinewave output power Pout into 4 or 8 Ohm: 12.5 W or 6.25 W (measured at 10.0 V peak-to-peak)
  • Output: short-circuit protected max. 2 A
  • Harmonic distortion: see Measurements panel
  • Zero-value noise: around 1.4 mW
  • Data formats: PCM 16, 24, 32-bit for each of 32, 44.1, 48, 96, 128 kHz Stereo
  • Dimensions (L x W x H): 89 x 33 x 30 mm
  • Weight without SD card: 26 g
  • Figures valid with a supply voltage of 5 VDC (digital) and 12 VDC (analogue) for a 1 kHz sinewave signal with 16 bits and 44.1 kHz sampling rate

Article Details:

  • Original publication: Elektor magazine issue 1/2018 on page 44.
  • Author: Falko Bilz
  • Free download expires: Friday 31 January, 2019.
  • Original article production number: 160460
  • PCB available: yes, see Products below

Like what you’re seeing? Then go to the article page and download a pdf copy of the full, original article. Downloading is free from Friday 24 January to Friday 31 January 2020.

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About mixos

Mike is the founder and editor of, an electronics engineering community/news and project sharing platform. He studied Electronics and Physics and enjoys everything that has moving electrons and fun. His interests lying on solar cells, microcontrollers and switchmode power supplies. Feel free to reach him for feedback, random tips or just to say hello :-)

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