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Author Topic: Capacitors...bigger or smaller?  (Read 3253 times)
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wn5t
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« on: November 19, 2005, 12:54:03 AM »

Greetings...

Well, I've spent the evening specifying capacitors for the DX-100 restoration.  Here's my "better ask the guys" question:  If one can't find the appropriate value capacitor, should one err on the side of more or less capacitance?  What is an acceptable deviation from the value specified by the unit designers?   Sure...one can connect values in series or in parallel...to an extent...to come up with the right value...usually.... 

Any guidance would be appreciated.

Thanks.  Hope to see ya soon on AM...

Michael
WN5T
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w3jn
Johnny Novice
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« Reply #1 on: November 19, 2005, 09:50:16 AM »

It depends HUGELY on the application.  In a frequency-determining circuit, you want to use the exact value and the correct temp compensation range.

Coupling caps for audio are usually better increased.  Bypass caps can be increased but be careful you don't overdo it as that can cause low frequency oscillations.

Filter caps can usually be increased, but this can increase strain on the rectumfrier toob and/or the power tranny (if you have solid state teh PS).  Some pi/net power supply filters can get a bit finicky as to value as well.

73 John
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FCC:  "The record is devoid of a demonstrated nexus between Morse code proficiency and on-the-air conduct."
Glenn NY4NC
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« Reply #2 on: November 20, 2005, 11:39:13 PM »

John, you forgot to tell him that filter caps also make a great hat for your dog!  Grin Grin Grin

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w3jn
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« Reply #3 on: November 21, 2005, 07:42:10 AM »

 Grin
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