In the simulation of the schematic I join to this message (gomez) not made by me, It appears the coupling capacitor to be of 2,2uF.
This capacitor value makes not possible to the output impedence to be very low at lower frequencies.
As you can see the out Z will be around 100 Ohm, only until 1 Khz.
Than will increase.
Now: HOW DO I HAVE TO CALCULATE THE EXACT VALUE OF THE COUPLING CAPACITOR IN THE SAME CIRCUIT SHOWN, TO HAVE THAT OUT IMPEDENCE (around 100 OHM) UNTIL THE LOWER FREQUENCIES (LET'S SAY 20 Hz)?
Thank you for helping. G.M.
This capacitor value makes not possible to the output impedence to be very low at lower frequencies.
As you can see the out Z will be around 100 Ohm, only until 1 Khz.
Than will increase.
Now: HOW DO I HAVE TO CALCULATE THE EXACT VALUE OF THE COUPLING CAPACITOR IN THE SAME CIRCUIT SHOWN, TO HAVE THAT OUT IMPEDENCE (around 100 OHM) UNTIL THE LOWER FREQUENCIES (LET'S SAY 20 Hz)?
Thank you for helping. G.M.