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    Thread: Surge protector

    1. #11
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      My Yamaha Receiver's (HTR-6230) internal power supply transformer got damaged due to surge/bad mains. I will adopt one of the above protections.

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      More info on Balanced PSUs

      gkannan sir - here are some pics of my DIY creation to help illustrate it better:

      This is one of my balanced PSUs. Has two 500VA EI core custom wound transformers in parallel, to give a total of 4 balanced AC outlets.

      As some of you have rightly pointed out the merits of an insolation transformer, this is essentially an isolation transformer too, but with some more advantages at no extra cost:

      1)Balanced mode outputs 110V (in phase and out of phase) at the output terminals instead of L & N. Effectively still giving 220VAC at the rails. But with one key advantage - common mode noise attenuation is in the 90dBs due to star grounding technique. So this effectively lowers the noise floor significantly and helping the noise filtering sections of audio equipment operate more efficiently.

      2) Surge protection - as in my previous post

      3) Voltage regulation - all such transformers have an inherent 3-4% regulation capabilities.

      4) A better power factor and better stability to reactive loads.

      5) Basic EMI and RFI filtering

      That said, care must be taken to ensure that one has a fully functional earth line before operating a balanced PSU. Also an EI core although slightly more difficult to make and heavier than a toroidal, provides much better high frequency attenuation, due to its inherent design.






    3. #13

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      outofthebox sir, absolutely brilliant. Is anything like this available commercially.
      Car Audio: 4-way active
      Home Audio: Passive

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      That's very elegant - is an SLD available for this?

      What are the transformer and capacitor ratings?

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      gkannan , derfaultier thank you for your kind words.

      I don't know of any local vendors but Equitech in USA is the go-to supplier of these kind of PSU's to major recording studios and home audio enthusiasts alike.

      I'm sure someone or the other must be making this in India too. Sorry can't be of more help here.

      My project was inspired by an article in a HiFi magazine and motivated by Equitech''s stratospheric pricing.

      Sharing the article - it includes a SLD and also the impact it has on home audio systems. The capacitor value I used is 0.47uF, 600V PPF type. It is not X2 rated but it works.

      The only differences in Equitech (I did get a peak under the hood many years back) compared to my implementation was a dual primary winding, a circuit breaker at the mains end, a DC blocking circuit and a thermal overload prevention circuit using NTC resistors.






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      Perfect - many thanks, outofthebox.
      gkannan sir, so this is the next project to be started-a?
      Last edited by derfaultier; 4th Jan 2016 at 08:23. Reason: Corrected spelling errors

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      Has there been in any progress to date now in 2019 ?

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      Quote Originally Posted by gkannan View Post
      Tagging Digital Vampire CMS outofthebox matbhuvi

      Guys need some inputs on surge protectors.

      One option is to localize and buy any of the surge protected extension boxes.

      I am however wondering if I can add surge protectors to the mains panel.

      I have three phase current with a changeover panel.

      How do I calculate the rating assuming excluding the equipments like A/c, washing machine, microwave etc.

      Here are few examples....

      https://www.industrybuying.com/surge...iLMaApq78P8HAQ


      http://www.amazon.in/Current-Mount-P...9-12d2a0c82d8f
      See previous question

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