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Author Topic: Kelmar PS instead of a Component Engineering? Bill Duelly Film Handler Posts: 92 From: Roselle Park, NJ Registered: Feb 2006 posted 03-26-2016 02:41 PM                     I have a Component Engineering LED setup in my rca sound head. Its recently developed some sporadic humming that does NOT seemed to be related to any wiring or connections. I want to swap power supplies to see if that is the culprit, but I only have a Kelmar ps. Can i use that instead of the CE power supply? If so, what do i do about the ground connection that the pre amp is looking for? Leave it unconnected or tie it to the - ? As always, Many thanks for input!  |  IP: Logged Mark Gulbrandsen Resident Trollmaster Posts: 16657 From: Music City Registered: Jun 99 posted 03-26-2016 06:03 PM                     You can but it seems that the grounding is different. I reccomend you compare schematics first. I have done it in the past but it was a long time ago. Personally, the C.E. Supply is the better of the two. And I would just fix it. Mark  |  IP: Logged Steve Guttag We forgot the crackers Gromit!!! Posts: 12814 From: Annapolis, MD Registered: Dec 1999 posted 03-26-2016 06:28 PM                     I'd be amazed if it was the power supply. I've put CE supplies on Kelmar readers without an issue. As for grounding...only the preamp power gets a ground reference to the reader board. The output should be referenced to the sound processor ground. I always floated the shield at the reader output but run a dedicated ground wire between the reader and the sound processor.  |  IP: Logged Mark Gulbrandsen Resident Trollmaster Posts: 16657 From: Music City Registered: Jun 99 posted 03-27-2016 10:10 AM                     I have had CE supplies die in past years, but way more Kelmars does than CE. The CE is also a current regulated supply and that is more desirable. Mark  |  IP: Logged Bill Duelly Film Handler Posts: 92 From: Roselle Park, NJ Registered: Feb 2006 posted 03-27-2016 08:47 PM                     Thank you all! I connected analog led output from the kelmar ps while maintaining the preamp power output from the CE. Left on for 2 hours and ran a reel and no hum issues. So i'm getting replacement CE power supplies then.  |  IP: Logged

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