Can somebody help me determine the proper values for some decoupling resistors and capacitors.
What I want to do is decouple the preamp and modulation stages from the 9vdc supply.
I would like to lose less than 1 volt because I need at least 7v for this build.
My book says
"RC time constant should represent a frequency 10 times lower than the lowest frequency you wish to amplify."
Not sure what values to choose for RC , so I don't lose too much voltage or alter my frequency response.
Any help?? Thanks
Decoupling Question
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Hides-His-Eyes
- Tube Twister
Try R = 0 and C = as big as you have space for (220-470u at 16-25V should do it)....
Testing, testing, won too fwee
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DrNomis
- Old Solderhand
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A good set of values for supply rail decouplers would be 100-220 Ohms for the resistor,and anything from 100-470uF (16-25V) for the capacitors..... 
Hope that helps....
Hope that helps....
Genius is not all about 99% perspiration, and 1% inspiration - sometimes the solution is staring you right in the face.-Frequencycentral.
If you know how much current the preamp will suck then you can find a resistor from:
R = V/I
(V is about 1V in your case, since you don't want to drop more than that).
Then you can find a suitable cap from:
C = 0.1 / R
Nearest standard values are fine.
R = V/I
(V is about 1V in your case, since you don't want to drop more than that).
Then you can find a suitable cap from:
C = 0.1 / R
Nearest standard values are fine.