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  1. R

    Teensy 4.0 - based Audio Guestbook

    A. This Dutch article [1] mentions that the DFG "Lyon" model shares the same electronics as the 7-series phones from the Bundespost (see FeTAp 751 and 791). The Bundespost FeTAp models had electret condenser microphones (ECM). These microphones typically require 4 to 10 volts DC, with the...
  2. R

    Teensy 4.0 - based Audio Guestbook

    A. I am using the Lyon / Marburg DFeAp 330 phone. I could find this description in the internet but did not help alot: https://www-deutsches--telefon--museum-eu.translate.goog/lyon.htm?_x_tr_sl=auto&_x_tr_tl=en&_x_tr_hl=en&_x_tr_pto=wapp From what I googled the microphone is unlikely to be an...
  3. R

    Teensy 4.0 - based Audio Guestbook

    Hi experts! I got the code and speaker etc to work but the microphone doesn’t. The microphone is connected to the Audio Shield, and I expected the Teensy to receive analog input from the mic via the Audio Shield’s MIC pin. However, the analog readings are incorrect, and the mic doesn’t pick up...
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