Post by thread:eliminating hum in a DAW system

> Your hum could be conducted noise from a (some) fluorescent fixtures. ...snip... Thanks, Peter, I would have never known this. The PICList is great!!! Can you tell me how you connected the caps and what value you used? Is your power system 50Hz or 60Hz? Mark ----- Original Message ----- From: "Peter L. Peres" <spam_OUTplpTakeThisOuTACTCOM.CO.IL> To: <.....PICLISTKILLspam@spam@MITVMA.MIT.EDU> Sent: Saturday, May 03, 2003 12:42 PM Subject: [EE]: eliminating hum in a DAW system -- http://www.piclist.com#nomail Going offline? Don't AutoReply us! email listservKILLspammitvma.mit.edu with SET PICList DIGEST in the body

>Can you tell me how you connected the caps and what value you used? >Is your power system 50Hz or 60Hz? 220V 50Hz. The caps are standard in fixtures here, except whoever put up the fixtures saved $2/per by not putting them in (which is a code violation). I think they are 0.5uF 400V. Usually there is some data on the ballast transformer or the fixture about cos phi and what capacitor is to be used to get it legal (above 0.8 here) if it does not have one inside. The capacitor is connected directly at the input of each fixture, in parallel with the power input. happy hunting, Peter -- http://www.piclist.com hint: To leave the PICList .....piclist-unsubscribe-requestKILLspam.....mitvma.mit.edu>