In a circuit, how is it possible to place a capacitor first and a resistance next in parallel, so that they filter out high frequencies?

MatlabSolutions provide the electrical assignment help for electrical engineering students. MatlabSolutions is the best company for assignment help.

This is the linked circuit:

In this circuit, C3 indeed acts as a low-pass filter to remove the high-frequency components of the carrier wave. But R1 is not part of the filter per se, it’s merely representing the load into which the circuit is driving.

D1 rectifies the high frequency AC into DC. C3 removes the “ripple” just like a power rectifier circuit, except that here the frequency of the AC is much higher. The varying DC level is the recovered audio. C3 needs to be chosen to remove the high frequency components (shunt them to ground) but not have any appreciable effect at audio frequencies. Calculation would follow just as for the ripple on a power supply, given the load driven (which is why R1 is shown).