38-7 audio "buzz"

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38-7 audio "buzz"

Chuck Schwark
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City: Evanston, IL

04-21-2008, 11:28 PM

Your hand is touching the metal object and capacitively coupling house AC wiring fields (hum) into the circuit. It's called hand capacitance effect. Your body is essentially a big "capacitor." Same effect when you touch the grid cap on an audio tube to check if the audio section is alive. You hear the hum.

Chuck Schwark,
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Messages In This Thread

38-7 audio "buzz" - by TonyJSenior - 04-21-2008, 03:44 PM

[No subject] - by justlrnin - 04-21-2008, 05:38 PM

[No subject] - by TonyJSenior - 04-21-2008, 06:40 PM

[No subject] - by Chuck Schwark - 04-21-2008, 09:27 PM

[No subject] - by Texasrocker - 04-21-2008, 11:06 PM

[No subject] - by Chuck Schwark - 04-21-2008, 11:10 PM

[No subject] - by TonyJSenior - 04-21-2008, 11:21 PM

[No subject] - by Chuck Schwark - 04-21-2008, 11:28 PM

[No subject] - by Texasrocker - 04-21-2008, 11:32 PM

[No subject] - by gary rabbitt - 04-26-2008, 10:24 PM

[No subject] - by exray - 04-27-2008, 01:14 AM

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