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BJT audio amplifier - CircuitLab
https://www.circuitlab.com/circuit/6syafk/bjt-audio-amplifier/#:~:text=BJT%20audio%20amplifier%20PUBLIC%20%20%20Created%20by,%20amplifier%20audio%20bjt%20filter%20frequency-dom%20...%20
BJT audio amplifier - CircuitLab
https://www.circuitlab.com/circuit/6syafk/bjt-audio-amplifier/
BJT as an Amplifier - The Engineering Knowledge
https://www.theengineeringknowledge.com/bjt-as-an-amplifier/
From this equation, you can see that the bjt used in circuitry gives amplification in the shape of voltage gain that is dependent on the values of RC and r’e. As RC is always significantly higher, the output voltage for this arrangement is larger than the input voltage. So, friends, it is a complete post about BJT as an amplifier.
EETimes - Discrete audio amplifier basics - Part 1 ...
https://www.eetimes.com/discrete-audio-amplifier-basics-part-1-bipolar-junction-transistor-circuits/
The stage gain of a BJT, used as a simple amplifier, can be determined from the relationship: V out / V in = h fe R L / ( R S + r i ) where R S is the source resistance, R L is the collector load resistor, h fe is the small-signal (AC) current gain, and r i is the internal emitter-base resistance of the transistor.
BJT Amplifiers 6 - Pearson
https://www.pearsonhighered.com/assets/samplechapter/0/1/3/4/0134420101.pdf
sistor (BJT) circuits are used as small-signal amplifiers. The term small-signal refers to the use of signals that take up a relatively small percentage of an amplifier’s operational range. Additionally, you will learn how to reduce an ampli-fier to an equivalent dc and ac circuit for easier analysis, and you will learn about multistage amplifiers.
bJT as an amplifier Project | Transistor Amplifier | Mini ...
https://techatronic.com/transistor-amplifier-circuit-using-bc547-transistors/
Take two bc547 transistors and connect the emitter pin of the first transistor with the base pin of the second transistor. Connect a 10K-ohm resistor between the base and collector pin of the first transistor. Join the negative wire of the speaker with the collector pin of the first transistor as shown above.
transistors - Question about bjt audio amplifier circuit ...
https://electronics.stackexchange.com/questions/316839/question-about-bjt-audio-amplifier-circuit
Thats a simple audio amplifier transistor/bjt circuit. I wonder why the capacitor C1 is used in the circuit when ac variations from the mic can be superimposed on dc directly in many ways. Secondly why voltage divider bias is used usually to make the audio amplifiers.
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