/diy/ - Do It Yourself

>>2034690
try looking at them in the frequency domain. you can analyze the RC low-pass filter as a simple voltage divider whose output is a frequency-dependent fraction of the input. the higher the frequency, the smaller the impedance of the C, and the more energy of that frequency gets sent to ground instead of the output
the why of any particular RC low-pass filter is dependent on the whys of the circuit around it. for a sampling application, you need to filter out high-frequency energy that create artifacts in the samples (Nyquist criterion, for those playing along at home). for a communications application, you might want to smooth off high frequencies before sending them over a long cable (= antenna) or, at the receiving end, sink any that might have been coupled onto the wire (= antenna). in a digital audio playback application, you will want to smooth the sharp steps of your output DAC to avoid generating inaudible ultrasonic harmonics that cloud up the high end
inversely, the RC high-pass filter is often deployed specifically to block dc, the lowest frequency energy. one practical example is the extraction of audio signal from a powered electret microphone, pic. the R supplies current to the class-A preamp inside the microphone capsule. the C couples the ac portions of the signal to the output. the value of C must be selected according to the RC filter equation so as not to lose too much audible low-frequency content

>>2034708
>Navy
some anons link to the NEETS course for obvious reasons
https://www.tech-service.net/neets/neets.htm

>>2034738
>SMD use is a feminine trait
we're reaching boomer levels that shouldn't even be possible