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Simple Single Transistor Audio Amplifier Circuit
https://theorycircuit.com/simple-single-transistor-audio-amplifier-circuit/#:~:text=If%20you%20want%20to%20built%20simple%20audio%20amplifier,Apply%209%20Volt%20DC%20supply%20for%20better%20result.
Audio Amplifier Circuit - UC Santa Barbara
https://web.ece.ucsb.edu/Faculty/rodwell/Classes/ece2c/labs/Lab%201a%20-%202C%202007.pdf
The Simplest Audio Amplifier Circuit Diagram
https://www.build-electronic-circuits.com/amplifier-circuit-diagram/
A list of Simple audio circuits and amplifiers for DIY(Do ...
https://www.circuitstoday.com/simple-audio-circuits
Simple Audio Amplifier : 5 Steps - Instructables
https://www.instructables.com/Simple-audio-amplifier/
Trimmer P1 is for adjusting input power. P1 is not necessary. Capacitor C1 is for filtering DC current out from audio signal. With resistors R1 and R2 we set voltage divider. With voltage divider we set working point of amplifier to half of the supplied voltage (4,5 V in this case). Resistor R3 and trimmer P2 are there to set amplifiers gain.
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