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Old 25th August 2010, 03:32 PM   #1221
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i only have this preamp now.....b1 buffer still needs to connect all parts and still no chassis yet.
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Old 25th August 2010, 03:44 PM   #1222
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if i turn the volume down to zero and put my ears close to the speaker, i can hear music (from the tuner) beyond the buzzing sound...very strange
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Old 25th August 2010, 03:53 PM   #1223
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buzzing is audible when you put your ears very close to the speaker....say about 2-3inch from the speaker and listen hard

Last edited by pmchoong; 25th August 2010 at 04:02 PM.
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Old 25th August 2010, 04:00 PM   #1224
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Buzzing from ac mains is expected with diode bridge and small filter caps, but once amplifier is connected to load it is not noticeable, when music plays. The only way to make it totally silent: 1. to use car batteries 2. to use regulated power supply.
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Old 25th August 2010, 04:14 PM   #1225
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you mean
1)the buzzing sound will always be there if you use mains
2)no way to completely eliminate the buzzing unless you use the two options as suggest by you

but i read many people said (in this forum) that it was completely silent....no back ground noise

Last edited by pmchoong; 25th August 2010 at 04:17 PM.
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Old 25th August 2010, 04:17 PM   #1226
koogar is offline koogar  United Kingdom
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Does the buzzing stop if you lift the earth ?
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Old 25th August 2010, 04:19 PM   #1227
AndrewT is online now AndrewT  Scotland
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Quote:
Originally Posted by diabloid View Post
once amplifier is connected to load it is not noticeable, The only way to make it totally silent: 1. to use car batteries 2. to use regulated power supply.
no.
Correct wiring and routing of wiring can give a silent power amp output.
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Old 25th August 2010, 04:19 PM   #1228
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Quote:
Originally Posted by koogar View Post
Does the buzzing stop if you lift the earth ?
how do you 'lift the earth'?
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Old 25th August 2010, 04:22 PM   #1229
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Quote:
Originally Posted by AndrewT View Post
no.
Correct wiring and routing of wiring can give a silent power amp output.
I have a very small chassis (hey...it was free, so no complain) and wires run besides the transformer. Please see picture
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Old 25th August 2010, 04:31 PM   #1230
Pocoyo is offline Pocoyo  Indonesia
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Quote:
Originally Posted by pmchoong View Post
I have a very small chassis (hey...it was free, so no complain) and wires run besides the transformer. Please see picture
hi

are they from alumunium ?
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