Reason for the use of the resistors an capacitors!?

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R6 and R7 are used for a DC-setpoint on the base of T3.

I just wonder, why are you keep asking if values are critical? Do you have only a very limited amount of components at hand? Do you actually to plan to build this circuit?


Stefaan
 


As I`ve told you already in an earlier thread, it is important to know the task and the function of each component - otherwise you cannot fix a meaningful value for it.
In this case, the resistor in the emitter path establishes dc feedback to stabilize the operating point, and the parallel C takes care that this feedback will be not effevtive for frequencies above the corresponding corner frequency.
 

hi
use parallel resistor for thermal stability so because this resistor decrees AC gain we use parallel capacitor with this resistor
 

hi..
resistor connected to emitter helps to keep the dc bias point at a fixed point through a regenerative action on the transistor...when emitter current increases coz of rise in temperature voltage drop across the resistor also increases which in turn decreases the voltage across the Vbe junction hence reducing the base current.capacitor in parallel is used as a bypass capacitor which provides a very low impendance path to the ac signal...details is given in the book microelectronics by sedra n smith...hope this will help you
 

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