Capacitors in Red - Circuit Functions

AI Thread Summary
The capacitors circled in red serve crucial functions in the circuit. They allow AC signals to pass while blocking DC bias voltage, ensuring that preceding circuits remain unaffected. The 4.7uF capacitor specifically enhances gain for frequencies above 66Hz. Additionally, the source resistor in parallel with this capacitor helps to set the DC bias point more accurately. Understanding these roles is essential for optimizing circuit performance.
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Does anyone know the purpose of the capacitors circled in red in the file attached? What are their functions in the circuit? Thanks!
 

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The capacitor allows the AC signal to pass, but blocks the DC bias voltage established by resistors so that any preceding circuit is not affected by it.
 
And the 4.7uF capacitor increases the gain above 66Hz. The source resistor in parallel with that cap is used to set the DC bias point more accurately.
 

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