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Old 17th May 2012, 02:04 PM   #2011
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HI APEX SIR ,
pls verify this gnd wiring.

with full volume, no input signal provided, the hum is coming through speakers , what is the solution?

i checked some professional amplifiers with full volume without input signal and no hum coming through speakers.
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Last edited by wattaniya; 17th May 2012 at 02:11 PM.
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Old 17th May 2012, 02:06 PM   #2012
AndrewT is offline AndrewT  Scotland
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wrong.
the signal grounds must go back to the main audio ground. The safety Earth is quite different.
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regards Andrew T.
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Old 17th May 2012, 02:13 PM   #2013
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Quote:
Originally Posted by nazirdigi View Post
HI APEX SIR ,
pls verify this gnd wiring.

with full volume, no input signal provided, the hum is coming through speakers , what is the solution?

i checked some professional amplifiers with full volume without input signal and no hum coming through speakers.
Connect wire from PSU GND to the input terminals, and from input terminals to the chassis
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Old 17th May 2012, 02:15 PM   #2014
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thanks andrewt,
which is main audio GND? (psu gnd or chassis gnd)?
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Old 17th May 2012, 02:18 PM   #2015
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Quote:
Originally Posted by apexaudio View Post
Connect wire from PSU GND to the input terminals, and from input terminals to the chassis
thanks for the reply.
my input terminals negative metal is already touching to the chassis.
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Old 17th May 2012, 02:25 PM   #2016
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Quote:
Originally Posted by nazirdigi View Post
thanks for the reply.
my input terminals negative metal is already touching to the chassis.
Ok, just connect wire from PSU GND to the input terminals, you can connect 100nF/400V from PSU GND to the chassis but only connect from GND to the chassis must be on input terminals.
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Old 17th May 2012, 02:30 PM   #2017
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i cant understand,
which is correct?
1-100nf/400v gnd to chassis.
2-gnd to input terminals negative.
3-gnd to chassis.
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Old 17th May 2012, 07:40 PM   #2018
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B500 TEF ROUTING PCB FINISHED.
starting to make the pcb with silkscreen.
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Old 19th May 2012, 08:14 PM   #2019
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hi apex sir,
i did what u said in post 2016, now no hum.

my camera focusing is little problem, that's why the images are smudge.
i used these tools to make the casing, taper,taper hande,mini circular saw,drill machine, jigsaw mashine,c clamp.
thanks.
Attached Images
File Type: jpg DSC06237 copy.jpg (313.5 KB, 767 views)
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File Type: jpg DSC06246 copy.jpg (144.1 KB, 515 views)
File Type: jpg DSC06252 copy.jpg (118.9 KB, 238 views)
File Type: jpg DSC06255 copy.jpg (263.6 KB, 247 views)
File Type: jpg DSC06262 copy.jpg (147.5 KB, 180 views)
File Type: jpg DSC06264 copy.jpg (123.3 KB, 105 views)
File Type: jpg DSC06268 copy.jpg (102.1 KB, 116 views)
File Type: jpg DSC06269 copy.jpg (111.1 KB, 94 views)
File Type: jpg DSC06271 copy.jpg (116.9 KB, 67 views)
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Old 20th May 2012, 10:01 AM   #2020
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Quote:
Originally Posted by nazirdigi View Post
hi apex sir,
i did what u said in post 2016, now no hum.

my camera focusing is little problem, that's why the images are smudge.
i used these tools to make the casing, taper,taper hande,mini circular saw,drill machine, jigsaw mashine,c clamp.
thanks.
Thanks for the pictures, what about sound?
Regards
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