How to determine Current requirements of Bench Power Supplies for Fieldcoil speakers? - diyAudio
 How to determine Current requirements of Bench Power Supplies for Fieldcoil speakers?
 User Name Stay logged in? Password
 Home Forums Rules Articles diyAudio Store Gallery Wiki Blogs Register Donations FAQ Calendar Search Today's Posts Mark Forums Read Search

 Equipment & Tools From test equipment to hand tools

 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
 16th January 2013, 06:24 AM #1 diyAudio Member   Join Date: Sep 2011 How to determine Current requirements of Bench Power Supplies for Fieldcoil speakers? . I want to use 2-4 identical model vintage fieldcoil woofers in my system, 2 for the midbass horns and 2 for the stereo basshorns. Each fieldcoil has an impedance of approximately 5200ohms and can dissipate 25 watts. This website utility calculates the Voltage requirements for a given fieldcoil speaker (which in this case works out to 361V per woofer). Field Coil Power Module at Ted Weber's Site I'm looking for the right bench power supply with variable voltage and variable current. 1) My problem is I do not know how to calculate how much current (amperes) I need per woofer (?). 2) Also, I've read you can wire multiple fieldcoil speakers in Series to a single power supply provided the PS has enough current for the combined load. If I can wire up in Series the fieldcoil connections of 2 or 4 of these FC woofers, it could save me from having to buy a separate PS for each woofer. So these are the two reasons I need to know how to determine how much current a given PS needs to have to provide power to my 5200ohm 25watt dissipation FC woofers. Thank you in advance for any assistance. .
 16th January 2013, 09:13 AM #2 diyAudio Member   Join Date: Jan 2010 Location: Titusville, Fl. 361V at 5200Ω, 361/5200=.0694 Amps. Aprx. 70 mA per woofer. It would be better to put the field coils in parallel than in series as you would need 722V at 70ma for two speakers or 1444V at 70ma for four speakers with the field coils in series. If you put the four speakers in parallel you would need a 361V 280mA (4*70mA) power supply, still deadly but 600V wire is a lot cheaper than 1500V wire. Last edited by RJM1; 16th January 2013 at 09:18 AM.

 Posting Rules You may not post new threads You may not post replies You may not post attachments You may not edit your posts BB code is On Smilies are On [IMG] code is On HTML code is OffTrackbacks are Off Pingbacks are Off Refbacks are Off Forum Rules

 Similar Threads Thread Thread Starter Forum Replies Last Post MrCurwen Tubes / Valves 17 28th October 2010 09:49 PM java PC Based 24 16th October 2009 07:27 AM ErikdeBest Equipment & Tools 2 6th March 2009 03:00 PM matt_uk Solid State 13 11th October 2004 09:49 AM fr0st Parts 7 27th April 2003 04:28 AM

 New To Site? Need Help?

All times are GMT. The time now is 10:04 AM.