On Mon, 18 Aug 2008 15:35:55 -0400, W8JI Tom wrote: >If the 12V supply has a ground connection common >to the negative lead post on the supply (or through other gear) the V- lead >voltage drop can cause a "pin 1" issue from dc potential that varies at an >audio rate.
YES! There's a similar problem on a lot of professional mix consoles, especially big ones with outboard power supplies. It shows up there in the form of hum/buzz issues. When we wrote AES48, we forgot about that mechanism, and didn't include it in the tutorial appendix. We'll probably add it when the Standard comes up for renewal in 2010. BTW -- several of us (including Joe Subich) have measured a significant DC voltage between connectors at the front and rear of the K3. This has the potential for doing exactly what you describe, depending on where that voltage appears in the circuitry! I built mine from the boards, and I took great pains to carefully install all the lockwashers and tighten all the screws. 73, Jim K9YC _______________________________________________ Elecraft mailing list Post to: [email protected] You must be a subscriber to post to the list. Subscriber Info (Addr. Change, sub, unsub etc.): http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/subscribers.htm Elecraft web page: http://www.elecraft.com
