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38-7 audio "buzz"
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, The Philco Repair Bench [Image: http://www.philcorepairbench.com/images/philog3tiny.gif] http://www.philcorepairbench.com
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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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