Pro Audio Asylum

Posted by grhughes (M) on November 03, 2005 at 09:25:04

In Reply to: Designing Phantom Power -Technical Considerations posted by DariusFranke@yahoo.com on October 30, 2005 at 09:23:27:

not a power supply decoupling resistor. I would recommend going to the Jensen TransformerWebsite.
http://www.jensen-transformers.com/apps_sc.html
Look in SCHEMATICS
APP AS016 and a bunch of other schematics have directions on how to implement it. You need to match the 6.8k resistors to better than .01 % with a digital VOM so buy more than two. Buy like a 100 and go through them. You can also buy a Power One or Condor 48 volt power supply that has an adjustment pot on it. Yes, you need a voltage regulator as a ripple filter. Some other schematics have LEDs and a charging cap and a switch. You just have to search and look around. Good luck! Ray
"Polarities are seldom aware of their polarness." Prospero