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What does this do?


 
4/30/2006 3:22 AM
Satamax What does this do?
Hi everybody!  
 
http://satamax.free.fr/filter.jpg>  
 
What does this thing when you input some AC in?  
 
Bye.  
 
Max.
 
4/30/2006 5:54 AM
Erik Runeson
There seems to be a spelling error in the link to the image - should read:  
http://satamax.free.fr/filter.jpg  
 
 
Anyway, it is a simple first order highpass filter.  
 
There is no point in having two caps in series like this, they can be replaced with a single cap with half the value (110p).
 
 
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4/30/2006 8:25 AM
Satamax
Thanks a lot Eric!  
 
Well, i drew it this way, because each cap dephasing the curent by 90 degres, i thought the curent out of the resistor would be 180 degres out of phase with with the one out of the caps, but i realize that it might not be that simple :D They form a smaller cap when in series, so it might not behave as expected dephasing teh signal. That's why they use a center resistor in bridged T filters? It's a high pass then, huh, does it act as a high pass to the ground when used as a cathode bypass circuit on a preamp valve?  
 
Thanks again. Max.
 
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