High Efficiency Speaker Asylum

• Not cheap..but I read someone was very happy - Bas Horneman 08:09:09 02/23/07 (3)
  In Reply to: Power-suppy for feild coil speakers posted by Rao on February 22, 2007 at 13:40:05:

  with the TENTLABS filament supplies

  A quote from a happy customer

  " A few weeks ago I asked about using the Tentlabs filament power supply for my field coil speakers. Well, I tried them and I have to say that they are best power supply I've used with these speakers "

  By the way I'm not affiliated with Tentlabs in any way.
  
  To infinity and beyond!!!
  

  • http://www.tentlabs.com/Products/Tubeamp/Tubefilament/index.html   (Open in New Window)

  
  

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  • It was me but... - xcortes 11:16:10 02/23/07 (0)
    In Reply to: Not cheap..but I read someone was very happy posted by Bas Horneman on February 23, 2007 at 08:09:09:

    After some time the tentlabs PS induced some noise to the speakers. I don't know why and just quit using them and went back to batteries. Might try them againone of these days.
    
    

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  • Re: Not cheap..but I read someone was very happy - Rao 09:49:26 02/23/07 (1)
    In Reply to: Not cheap..but I read someone was very happy posted by Bas Horneman on February 23, 2007 at 08:09:09:

    What would be the skill level needed to assemble one of these?
    
    

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    • Pretty easy... - Bas Horneman 09:57:41 02/23/07 (0)
      In Reply to: Re: Not cheap..but I read someone was very happy posted by Rao on February 23, 2007 at 09:49:26:

      You need a transformer and an enclosure to put it in. Take the wires from the transformer insert them into the unit. And then take wires to you field coils. (You'd need to discuss with the supplier what current and voltage they need to be set at)
      To infinity and beyond!!!
      
      

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• Re: Power-suppy for feild coil speakers - Bappe 05:28:41 02/23/07 (0)
  In Reply to: Power-suppy for feild coil speakers posted by Rao on February 22, 2007 at 13:40:05:

  A Constant Current Supply is what you should go for since current is what builds up the field. If you use a constant voltage supply the magnetic field will vary with the temperature of the coil.

  BR,
  Anders
  
  

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• Re: Power-suppy for feild coil speakers - tomitune 22:48:21 02/22/07 (0)
  In Reply to: Power-suppy for feild coil speakers posted by Rao on February 22, 2007 at 13:40:05:

  CE dc regulated power supply. I use these on a pair of Supravoxes. Model # HY3005D but there are several versions depending upon voltage and current requirements. Check this site out for supply.

  
  http://www.elexp.com/tst_3003.htm
  
  
  

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• YES! - Gerry E. 14:33:11 02/22/07 (2)
  In Reply to: Power-suppy for feild coil speakers posted by Rao on February 22, 2007 at 13:40:05:

  

  I recently asked a question on this Asylum about a suitable battery to power FC tweeters. I only got one joke response, so I gave up on the battery idea. I did some more research and found a "cheap but good" dual output power supply for $99 plus shipping (see link below).

  I have been using it for the past two weeks and it works great. You can vary the output voltage from 0 - 30V and the current from 0 - 2A. They have other, more powerful models, if you need more voltage and/or current. I checked various output voltages on my DMM and they are very accurate. Also, the digital readouts are really nice and make setup a breeze. Highly recommended!

  Gerry
  

  • Cheap But Good Power Supply   (Open in New Window)

  
  

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  • Re: YES! - fatbottle 16:53:31 02/22/07 (0)
    In Reply to: YES! posted by Gerry E. on February 22, 2007 at 14:33:11:

    Hi ,
    That was not a joke suggestion !!!!!

    cheers

    
    
    

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  • Re: YES! - Rao 14:46:10 02/22/07 (0)
    In Reply to: YES! posted by Gerry E. on February 22, 2007 at 14:33:11:

    Thanks, thats a great site
    
    
    

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• Field coil speakers - Rao 14:19:46 02/22/07 (5)
  In Reply to: Power-suppy for feild coil speakers posted by Rao on February 22, 2007 at 13:40:05:

  In the process of buying the Fertin 20ex. Would it be easier to go with a SLA battery since I have the ClariT amp with charger?
  
  

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  • Re: Field coil speakers - nullspace 14:55:12 02/22/07 (4)
    In Reply to: Field coil speakers posted by Rao on February 22, 2007 at 14:19:46:

    SLA batteries for Fertin 20EX are highly recommended; I wouldn't use anything else with mine. Do yourself a favor, though: spring for a 26ah battery and a 1ah charger.

    Regards,
    John
    
    

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    • SLA Batteries - Rao 15:01:13 02/22/07 (3)
      In Reply to: Re: Field coil speakers posted by nullspace on February 22, 2007 at 14:55:12:

      Can you describe your setup in more detail becauseI'm no techie.
      Thanks
      
      

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      • Re: SLA Batteries - nullspace 06:59:49 02/23/07 (2)
        In Reply to: SLA Batteries posted by Rao on February 22, 2007 at 15:01:13:

        There's not much to it. Hook up the two drivers in parallel to the battery. Red binding posts to red connection on the battery and black binding posts to black connection on the battery, and bob's your uncle. Disconnect when not playing music, and charge after about 6 hours of use assuming a 26ah battery.

        Regards,
        John
        
        

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        • Re: SLA Batteries - Rao 08:09:45 02/23/07 (1)
          In Reply to: Re: SLA Batteries posted by nullspace on February 23, 2007 at 06:59:49:

          So there is no need for a voltage and amp regulator for the battery?
          
          
          

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          • Re: SLA Batteries - nullspace 10:16:25 02/23/07 (0)
            In Reply to: Re: SLA Batteries posted by Rao on February 23, 2007 at 08:09:45:

            Not unless you want a supply voltage/ current other than that dictated by V=I/R where R=~10ohms (that's about what my field coils measure)...

            Seriously, it's too simple and it sounds great.

            Regards,
            John
            
            

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• Re: Power-suppy for feild coil speakers - sser2 14:12:53 02/22/07 (0)
  In Reply to: Power-suppy for feild coil speakers posted by Rao on February 22, 2007 at 13:40:05:

  You need to know the resistance of the field coil. This could be anything from several Ohms to several kOhms, which will require voltages from few to several hundred volts. There is no universal power supply that would cover all possible voltage and current requirements.

  For low resistance coils, 5 V and 12 V computer power supplies may be useful. 500-700 Ohm coils can be powered from a wall outlet through full wave rectifier and RC filter. For kiloOhms, a step-up transformer will be needed.
  
  

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• Re: Power-suppy for feild coil speakers - xcortes 13:54:44 02/22/07 (0)
  In Reply to: Power-suppy for feild coil speakers posted by Rao on February 22, 2007 at 13:40:05:

  what field coils you have?
  
  

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