Coding in Electrical Engineering, electronics podcast, MacroFab, macrofab engineering podcast, MEP, MIDI, mSAP, PCB Sandwich, PCM5122, Podcast, Pong, Teensy

MEP EP#108: Crazy Transistor Contraptions

Download: MP3
RSS Feed: Link
Twitter: @MacroFab

Runtime: (00:59:26)

Parker Dillmann
Stephen Kraig


Podcast Notes

  • Stephen
    • Midi Woes
    • At least the Teensy is fast
  • Parker
    • DAC testing update
      • Interesting results looking at the spectrum analysis of the DACs
      • Film caps suppress harmonics better but let more low end frequency through
      • “Audio” grade parts have a higher response over the frequency band
      • All the DAC load outs have a flat frequency response
      • Blind testing resulted in listeners picking the cheaper passive load out for the DAC saying it sounded more “spacious”/”open”/”dynamic” compared to the film caps.
  • Rapid Fire Opinion R.F.O.

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Stephen testing out the Audio DACs in a blind listening test. Seems Parker and Stephen like to use USPS boxes for quick and dirty electronic project boxes.

FFT of a 1kHz signal through the Film Capacitor loaded DAC and the all Ceramic Capacitor loaded DAC. Film capacitor DAC is green. Ceramic Capacitor DAC is red. Harmonics are higher on the Ceramic Capacitor DAC but the low end frequency area is lower.



Special thanks to whixr over at Tymkrs for the intro and outro!