Have a question here :
http://forum.allaboutcircuits.com/showpost.php?p=613400&postcount=22
What is the relationship actually ?
Thanks !
Putting an RC circuit after the detector in a TFR (tuned frequency receiver) creates either a low pass or high pass filter depending on which way the capacitor is put, before or after the resistor load. There is no need for the resistor because the wires and the inductor offer DC resistance, thus putting a capacitor after the detector creates a low pass filter. The low pass filter is used in the TFR to remove the remaining half of the RF carrier wave after the detector.
An RC circuit is put before the detector in the super het (super heterodyne receiver) to remove the undesired beat frequencies.
I'm not sure what you were trying to ask about charging and discharging. Yes, a capacitor charges and discharges. A bigger capacitor can hold more charge, and how fast it discharges is determined by the resistive load. Say you have a water pump pumping water up into a bucket. The water pump is the battery which is pumping charge into the bucket. Say that the bucket is connected to a garden house at the bottom. The garden hose is the resistive load. The more coils, kinks, and length of the garden hose, the greater the resistive load and the longer it takes the water molecules or charge to drain from the bucket. The bigger the capacitor, the faster the
discharge rate because there is more charge stored in the bucket that has a potential energy (voltage) that forces itself through the garden hose faster. The discharge rate is charge per second, which is electric current. However, the bigger the capacitor, the longer it takes for
all charge to drain, which is why bigger capacitors are used in LC circuits at lower resonant frequencies.
