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Input and Output Coupling - All About Circuits
https://www.allaboutcircuits.com/textbook/semiconductors/chpt-4/input-and-output-coupling/
We still like to illustrate texts with transformer coupled audio amplifiers. The circuits are simple. The component count is low. And, these are good introductory circuits— easy to understand. The circuit in Figure below (a) is a simplified transformer-coupled push-pull audio amplifier. In push-pull, pair of transistors alternately amplify the positive and negative portions of the input signal.
Audio Amplifier Circuit
https://web.ece.ucsb.edu/Faculty/rodwell/Classes/ece2c/labs/Lab%201a%20-%202C%202007.pdf
Electrical characteristics of audio speakers Characteristics of condenser microphones Design of single-supply battery-operated op-amp circuits Use of diode limiters/clamps for input protection Use of active filters for tone control Choice of AC coupling capacitors
AC vs DC coupling: What is it? – Noise Engineering
https://noiseengineering.us/blogs/loquelic-literitas-the-blog/ac-vs-dc-coupling-what-is-it
Remember that an AC-coupled circuit is just acting as a highpass filter, so generally, they will filter out LFO signals. If a circuit is AC-coupled to filter out everything below 10hz, a 1hz LFO (which is actually relatively fast for a modulation signal) still won’t make it through. Even though LFOs move back and forth, think of them as DC.
ecp audio diy: Some Notes on Coupling Capacitors
http://diy.ecpaudio.com/p/some-notes-on-coupling-capacitors.html
Ceramic Capacitors in audio coupling circuits- bad news
https://antiqueradios.com/forums/viewtopic.php?t=376868
Joined: Jan Tue 07, 2020 1:41 am. Posts: 4369. Location: Belleview, FL 34420. Some very talented techs on this site will use a ceramic capacitor in audio coupling circuits. Ceramic capacitors provide a poor audio response. Here is why you should use polypropylene capacitors in audio coupling circuits.
Optocoupler Circuits | Nuts & Volts Magazine
https://www.nutsvolts.com/magazine/article/optocoupler-circuits
Audio-coupling circuit. Here, the op-amp is connected in the unity-gain voltage follower mode, with the optocoupler LED wired into its negative feedback loop so that the voltage across R3 (and thus the current through the LED) precisely follows the voltage applied to the op-amp’s pin 3 non-inverting input terminal.
effects from coupling capacitors in audio circuits - YouTube
https://www.youtube.com/watch?v=eF8e-FmtDh4
The video shows the "bandpass" from different capacitor values used as coupling capacitor in audio circuits (20 Hz - 20 KHz). The "sound" changes completely ...
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