|Digital Source Digital Players and Recorders: CD , SACD , Tape, Memory Card, etc.|
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
||Thread Tools||Search this Thread|
|15th February 2012, 08:50 PM||#1|
Join Date: May 2009
This morning I found my DAC with a nasty 60Hz hum coming from the right channel and little to no signal. I assumed it's the power supply so I start probing the regulators in the power supply. Nothing seems too out of of whack. None of the caps seem disturbed. I unplug briefly to turn unit over and check regs that are located on each pcb. Nothing out of the ordinary. I plug back in to give another listen. Everything seems fine. Then, about 10 minutes later the right channel starts getting really distorted and finally ends up with that same 60Hz hum.
So I unplug unit. Rewire so that the I/V (passive resistor) section from each channel feeds the opposite channel output buffer. Idea is to see if the problem comes before or after this point in the chain. Ie. if the distortion/hum moves to opposite channel, problem is located at the DAC conversion stage. If not, it's in the output buffer.
Plug back in and no more hum. It's been playing non stop for almost 5 hours now with no issues.
Anyone have ideas as to what may have been going on??
Note: after the first few hours I returned the I/V outputs to their respective output buffers. Still playing with no problems at all.
Last edited by champ04; 15th February 2012 at 08:58 PM.
|15th February 2012, 09:54 PM||#2|
Join Date: Mar 2009
Seems to me that something didn`t make connection to the I/V-stage anymore, looking from the output inwards that is (not from the dac to the preamp or what you have there, but from preamp to dac).
Look for bad connections in ground:
Do both output cables connect well to ground/no loose contacts?
Both passive resistors soldered well? etc.
It helps if you get the problem back again. In that case:
check signal cables and verify grounding everywhere.
If it persists, it`d help to know what schematic you use.
|Thread Tools||Search this Thread|
|Thread||Thread Starter||Forum||Replies||Last Post|
|noob with a perplexing problem.||_vi||Solid State||18||1st March 2010 07:04 AM|
|-V problem||laki101||Power Supplies||0||26th January 2010 04:42 PM|
|Please help for B+ problem!||SKLau||Tubes / Valves||7||25th July 2008 02:56 AM|
|problem||Ricky||Introductions||4||16th September 2005 07:53 PM|
|What's my problem?||Skankadellic||Solid State||3||12th July 2003 04:19 PM|
|New To Site?||Need Help?|