BOSUZ Hum

hifileslie · 28th October 2006, 10:53 AM

I have just completed my BOSUZ built on purpose built PCBs with 2 torroidal transformers and a thyristor to connect circuit ground to chassis ground ( at the same place). Unfortunately I get a fairly loud and identical hum from both channels with no sources connected and with a CD player connected. The hum is constant and does not vary with volume. With a CD playing the music drowns the hum at 1/2 volume and there appears to be no/little distortion. Help please!

hifimaker · 28th October 2006, 05:12 PM

You may have a ground loop or perhaps your signal ground is connected to earth ground? A schematic is helpful that shows how the grounds are wired.

Do a search on this forum for ground loops, you may find your answer.

-David

28th October 2006, 10:53 AM	#1
hifileslie diyAudio Member Join Date: May 2002	BOSUZ Hum I have just completed my BOSUZ built on purpose built PCBs with 2 torroidal transformers and a thyristor to connect circuit ground to chassis ground ( at the same place). Unfortunately I get a fairly loud and identical hum from both channels with no sources connected and with a CD player connected. The hum is constant and does not vary with volume. With a CD playing the music drowns the hum at 1/2 volume and there appears to be no/little distortion. Help please!

Thread Tools	Search this Thread
Show Printable Version Email this Page	Search this Thread: Advanced Search

New To Site?	Need Help?
Register to Participate Search Privacy Statement Contact Us	Frequently Asked Questions Did you forget your password? Mark Forums Read


	Please consider donating to help us continue to serve you. Ads on/off / Custom Title / More PMs / More album space / Advanced printing & mass image saving

28th October 2006, 05:12 PM	#2
hifimaker diyAudio Member Join Date: Oct 2003 Location: San Jose	You may have a ground loop or perhaps your signal ground is connected to earth ground? A schematic is helpful that shows how the grounds are wired. Do a search on this forum for ground loops, you may find your answer. -David