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EFIE Manual Question
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hydrodine Offline

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Joined: Mar 2008
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Post: #1
EFIE Manual Question
I just recieved my book from George Wiseman and in the fixed design components on page 4 he gives the range of C4 from 0.047 to 20 uf, what sould i use? I am ordering the transformer you use from digikey.

03-21-2008 09:55 AM
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mike Offline
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Post: #2
RE: EFIE Manual Question
For C4 I use .01 uF, somewhat less than George recommends there. However, the exact value here is not very important. It's purpose is to clean up the noise on the power into the timer chip, which has already been cleaned up largely by the voltage regulator.

But the data sheet for the family of timer chips I use, (SE555 by Texas Instruments) recommends .01uF here, and so that's what I use. But truthfully, I've also used higher values and noticed no change in characteristics by doing so.

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03-21-2008 10:10 AM
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