Why do we need A Resistor in this Circuit ?

Thread Starter

tallo

Joined Mar 4, 2011
12
Hi everyone,

In the sound detector circuit we use Microphone to convert the audio signal to electrical signal and then pass it through a high pass filter to remove dc offset
but i can use only capacitor to do this job ! why we need a resistor in parallel with it ?

thanks
 

Shagas

Joined May 13, 2013
802
Post the schematic

If you just use a capacitor then you are just coupling the signal to remove DC offset , If you are using a cap in series and resistor in parallel then it's going to become a high-pass filter (I think)
 
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