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The question is not specific enough.
I think you mean in a simple crystal radio, using a diode detector.
The small value capacitance after the detector, takes any stray RF frequency down to earth, before being passed onto the headphones, where it would otherwise swamp the headphone coils.
What else can I help you with?
Which detector is used in tv receivers?
Diode detector
What type of diode is used as a variable capacitor?
varactor diode is a correct answer
What is diode detector?
there are two types:- 1) simple diode detector 2) practical diode detector the diode is common device used in am demodulator. signal(am demodulator signal ) is applied anode and output is taken from cathod
What is the difference between detector and diode detector?
difference between detector and diode
What is the function of diode detector?
the function of a diode detector is to detect stuff
Am demodulator diode detector circuit pdf?
diode detector for am demodulation
What are the applications of 0A79 diode?
0a79 ( germanium diode )in glass construction form is used in AM detector circuits.
Where you use of diode 1n34?
The 1N34 is a germanium signal diode, so it would be used as a detector/mixer in a.m. reception for example.
What is envelope detection?
When an AM signal is received, the receiver must perform a converse process to get the original signal ( Information Signal ) back . This process is known as detection or demodulation, the simplest process which is used widely in AM radios is the Envelop Detector . Envelop Detector is an electronic circuit which is used to recover ( Demodulate ) the original signal in AM systems, its constructed from just one diode, one capacitor and one resistor . This is essentially just a halfwave rectifier which charges a capacitor to a voltage = the peak voltage of the AM signal . However .. the output of the detector follows the envelop of the modulated signal. On the positive cycles of the input signal, the diode conducts and the capacitor charges up to the peak voltage of the input signal. As the input falls below this peak value, the diode is cut off, because the capacitor voltage is greater than the input signal voltage, thus causing the diode to open. The capacitor now discharges through the resistor at slow rate . The discharge process continues until the nest positive half-cycle. When the input signal becomes greater than the output across the capacitor, the diode conducts again and the process is repeated .
What diode is used as voltage controlled capacitor?
It is called a varactor or a varicap diode. Its capacitance varies nonlinearly with the reverse voltage applied to its terminals.
Can you use a capacitor instead of zener diode in biased clipping circuit?
No. The purpose of the zener diode is to clip (turn on) at a certain voltage. A capacitor will not exhibit this behavior.
Which diode used for voltage controlled capacitor?
Varactor didoe is used as voltage controlled capacitor.it is generally used in reverse bias condition.
