usher R1.5 noise

david foster · 28th December 2009, 07:39 PM

When I turn on my Usher amp I get a humming noise which seems to have increased in volume. When I first purchased the amp the hum was not very noticeable (its more of a ringing sound) I don't think it is a grounding problem. There seems to be no problem with how it functions sound is great etc. but the noise is noticeable when there is a lull in the music, does anybody have any idea what could be causing this?
Thanks David

nigelwright7557 · 29th December 2009, 12:10 AM

If its hum then it will be 50Hz getting in somewhere.

Have a look at the power rails for excessive ripple.

Other than that try it with input shorted and see if it is the amp or something connected to it.

I find I have to connect or disconect the earth to the zero volt line depending on what I am driving the amp from. For an MP3 player i need the earth connected. For a mains powered pre amp taht is already earthed i have to disconnect the earth from the amp.

david foster · 29th December 2009, 06:25 PM

Ok, I will try what you have suggested. Thanks for your help

28th December 2009, 07:39 PM	#1
david foster diyAudio Member Join Date: Dec 2009	usher R1.5 noise When I turn on my Usher amp I get a humming noise which seems to have increased in volume. When I first purchased the amp the hum was not very noticeable (its more of a ringing sound) I don't think it is a grounding problem. There seems to be no problem with how it functions sound is great etc. but the noise is noticeable when there is a lull in the music, does anybody have any idea what could be causing this? Thanks David

29th December 2009, 12:10 AM	#2
nigelwright7557 diyAudio Member Join Date: Apr 2008 Location: Carlisle, England	If its hum then it will be 50Hz getting in somewhere. Have a look at the power rails for excessive ripple. Other than that try it with input shorted and see if it is the amp or something connected to it. I find I have to connect or disconect the earth to the zero volt line depending on what I am driving the amp from. For an MP3 player i need the earth connected. For a mains powered pre amp taht is already earthed i have to disconnect the earth from the amp. __________________ http://www.murtonpikesystems.co.uk PCBCAD40 pcb design software.

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

Similar Threads
Thread	Thread Starter	Forum	Replies	Last Post
Tda1541 R1??	HeadSh0T	Digital Line Level	21	12th January 2010 01:25 PM
Raven R1	joeling39	Planars & Exotics	2	27th July 2009 04:04 AM
WTB 3 qty Usher T-9950 & Usher Qty 1 - 8845	markmelheim	Swap Meet	1	17th May 2006 10:15 PM
For sell TDA1541A-R1	bezobraznia	Swap Meet	6	17th January 2006 11:29 AM

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

29th December 2009, 06:25 PM	#3
david foster diyAudio Member Join Date: Dec 2009	Ok, I will try what you have suggested. Thanks for your help

Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)