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38-7 audio "buzz"
Chuck Schwark
Phorum Expert
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Posts: 1,703
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Joined: Sep 2005
City: Evanston, IL
#8

04-21-2008, 10:28 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, 02:44 PM
[No subject] - by justlrnin - 04-21-2008, 04:38 PM
[No subject] - by TonyJSenior - 04-21-2008, 05:40 PM
[No subject] - by Chuck Schwark - 04-21-2008, 08:27 PM
[No subject] - by Texasrocker - 04-21-2008, 10:06 PM
[No subject] - by Chuck Schwark - 04-21-2008, 10:10 PM
[No subject] - by TonyJSenior - 04-21-2008, 10:21 PM
[No subject] - by Chuck Schwark - 04-21-2008, 10:28 PM
[No subject] - by Texasrocker - 04-21-2008, 10:32 PM
[No subject] - by gary rabbitt - 04-26-2008, 09:24 PM
[No subject] - by exray - 04-27-2008, 12:14 AM



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