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Audio input GND must be common to GND of the conditioning circuit and GND of the Teeny 4.1. The audio input to the teensy 4.1 is pin A2

MarkT, already on the topic and appealing to your experience in this type of projects, then what would be the correct way to take the audio signal from one of the 3.5 mm outputs of the PC motherboard, to process it on pin A2 of a teensy 4.1...

I built the conditioner with SMD components, I didn't have a 2.2K resistor on hand, I had a 2.4K one, I don't think it affects the resulting signal too much. I used ceramic capacitors and a 3.5mm stereo adapter. Check the wiring again, a couple...

I just have the conditioner installed on the teeny 4.1. The audio signal comes from the PC, from a 3.5 mm output. In the screenshot you can see the result from the serial plotter of the Arduino IDE, 4 audio-files are played simultaneously with...

The first thing is to condition the audio signal so that information about its behavior is not lost. This circuit to condition the audio signal on pin A2 of your teensy is a good start. Try this code: #include <Audio.h> AudioInputAnalog...

The relay is just a switch for the power supplied to the fan. This is the simplest example I can reduce the controller I built to: int PINRELEFan1 = 39;// Fan1 PWM int PWMControlFan1= 33;// Fan1 Rele int SALIDAPWMFan1 = 1; // RPM base...

The first step is to define how you are going to power the fan. For safety, it is convenient that you can turn it off or on at any time. To do this you can use a relay board, there are 2, 4, or 8, depending on what you want to connect. There are...