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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...

A. I would definitely order an electret microphone, even if just to eliminate it as the problem source. They're pretty cheap (about £2.50 on UK eBay); I ordered several different models just in case one was troublesome, but they all seemed to...

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...

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...