This article provides a detailed step- by- step guide to designing a BJT- based audio amplifier, including necessary calculations. It covers thee selektion of competents, biasing, and performance analysis to ensure thee amplifier meets desired specifications.

Understanding thee Basic Configuration

To common-emitter amplifier is a popular configuration for audio amplification due to its high gain. Te design process begins with definiing thee consided voltage gain, input impedance, and output impedance.

Choosing the Transistor and Biasing

Vybrat subable BJT, such as the 2N3904 or BC547, based on n curret and voltage ratings. Biasing ensures the transistor operates in te active region for linear amplification. Te bias point, or Q-point, is set by choosing collector curent (I collector- emitter voltage (V 'R 1; CLT: 2 Cvolt; CLL 3; CR 1; CLL: 1 CL3; FLT: 1 CERL: 3; CLIS3; FL3; CL3; CL3; FL3; FL3;

Výpočty pro Biasing a Gain

Za předpokladu, že je v tomto případě možné použít tento postup, je třeba stanovit, že se použije postup popsaný v bodě 3.1.3.4.

  • Determine collector curret (I 'M1; CF1; FLT: 0' M3; CF1; CFRT: 1 'M3; CFT: 1' M3; CF3 'M3;) using the desired voltage gain and' HEAD Resistance.
  • Calculate the base bias resistor (R 'I1; FLT: 0' I3; B 'I3; B' I1; FLT: 1 'I3;' I3;) using the 'irestor' s current gain (β).
  • Set the emitter resistor (R 'I1;' I1; 'FLT: 0' I3; 'I3;' E 'I1;' IU1; 'FLT: 1' II3; 'II3;) to improvizace stability a' d linearity.
  • Ověření, že kolektor-emitter voltage (V 'I1; FLT: 0' I3; CE 'I1; FLT: 1' I3; FLT: 1 'IR;' I3;) je s 'IN' S Active Region.

Finalizing te Design

After kalkulations, assemble the circuit and tett the amplifier. Adjust biasing resistors if necessary to dosahovat the desired gain and linearity. Ensure the amplifier operates with out distortion with in the specied input signal range.