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      I should've originally specified the op-amps are a LM1458N chip, which is powered by a 7915 and 7815 regulator. PaulS, yes it is that module. Yes, I had it working in the basic arrangement, powered by USB. The speaker is 8Ω 2W. I have said the...
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      Hello, I am trying to communicate with a DFMiniPlayer using a Teensy4.0. I am powering the teensy with a 7805 regulator. However, when powering with the external regulator I just get a high pitched noise coming out of the speaker, with no music...
      • DFMiniPlayerSchematic.png
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