[Coco] Powering up our retro systems

[wrcooke at wrcooke.net]

   Oh, well.

   On January 27, 2020 at 10:14 AM Dave Philipsen < [1]dave at davebiz.com>
   wrote:

   I read the document (or at least the pertinent parts) and it said, "The

   result is that a higher than normal leakage current will flow when a

   voltage is applied after prolonged storage. As the oxide layer is

   regenerated in use, however, the leakage current will gradually decline

   to its normal level. When designing application circuits, attention
   must

   be paid to the fact that after storage the leakage current may be up to

   100 times higher than normal during the first few minutes following the

   application of power."

   Then under the storage section it said, "If the capacitors have been

   stored at temperatures above +35°C or for longer than above-mentioned

   periods, it is necessary to consider whether the application circuit is

   able to tolerate high initial leakage currents. If this is not the
   case,

   one should perform the special reforming procedure."

   So here's what I glean from the document.  Make sure your power supply

   is designed in such a way that it will tolerate/sustain an initial

   leakage of at least 100x the normal leakage current after the circuit

   has remained idle for some time. If your circuit can't sustain that,

   then you may need to manually reform the capacitor(s). As long as your

   circuit is tolerant of that, the capacitor(s) will reform by virtue of

   their being used after a relatively short amount of time.

   And the document reiterates what I said, that high temperatures are the

   biggest culprits. So you can either allow the CoCo power supply to

   reform the capacitors (which it likely has the capacity to do in most

   cases) after a prolonged storage period or you can gradually apply

   voltage starting at a lower potential in the case of the power supply

   not having the ability to sustain the higher leakage currents at its

   rated voltage.

   So from what I understand, the only reason to be concerned about the

   CoCo's ability to reform the caps on its own by merely turning the CoCo

   on, is if the power supply doesn't have enough "oomph" to handle the

   higher leakage currents.  And from your statement that the transformer

   is capable of delivering ten amps of power (albeit for a limited time)

   then I would have a hard time thinking that the power supply couldn't
   to

   that.

   Dave

   On 1/27/2020 8:05 AM, [2]wrcooke at wrcooke.net wrote:

   This document:

   [3]
   [3]https://www.tdk-electronics.tdk.com/download/530704/6ad5ed9e1ff4f727

   c328cb92da2adf2b/pdf-generaltechnicalinformation.pdf

   From TDK, a reputable manufacturer of electrolytic caps, has a great

   deal to say about the life and storage of them. It specifically says

   they are expected to be reformed after storage. See sections 3.7.7 and

   7.3

   Best,

   Will

   But that's just me.

   Good luck.

   Will

   References

   1. mailto: [2] [4] [4]dave at davebiz.com

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   left to add, but when there is nothing left to take away." -- Antoine

   de Saint-Exupery

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   -- [7] [7]https://isocpp.org

   References

   1. mailto: [8] [8]dave at davebiz.com

   2. mailto: [9] [9]dave at davebiz.com

   3. mailto: [10] [10]Coco at maltedmedia.com

   4. [11] [11]https://pairlist5.pair.net/mailman/listinfo/coco

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   Coco mailing list

   [12] [12]Coco at maltedmedia.com

   [13] [13]https://pairlist5.pair.net/mailman/listinfo/coco

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   Coco mailing list

   [14] [14]Coco at maltedmedia.com

   [15] [15]https://pairlist5.pair.net/mailman/listinfo/coco

   "A designer knows he has achieved perfection not when there is nothing

   left to add, but when there is nothing left to take away." -- Antoine

   de Saint-Exupery

   "The names of global variables should start with // "

   -- [16]https://isocpp.org

   References

   1. mailto: [17]dave at davebiz.com

   2. mailto: [18]wrcooke at wrcooke.net

   3.
   [19]https://www.tdk-electronics.tdk.com/download/530704/6ad5ed9e1ff4f72
   7c328cb92da2adf2b/pdf-generaltechnicalinformation.pdf

   4. mailto: [20]dave at davebiz.com

   5. mailto: [21]Coco at maltedmedia.com

   6. [22]https://pairlist5.pair.net/mailman/listinfo/coco

   7. [23]https://isocpp.org/

   8. mailto: [24]dave at davebiz.com

   9. mailto: [25]dave at davebiz.com

   10. mailto: [26]Coco at maltedmedia.com

   11. [27]https://pairlist5.pair.net/mailman/listinfo/coco

   12. mailto: [28]Coco at maltedmedia.com

   13. [29]https://pairlist5.pair.net/mailman/listinfo/coco

   14. mailto: [30]Coco at maltedmedia.com

   15. [31]https://pairlist5.pair.net/mailman/listinfo/coco

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   Coco mailing list

   [32]Coco at maltedmedia.com

   [33]https://pairlist5.pair.net/mailman/listinfo/coco

   "A designer knows he has achieved perfection not when there is nothing
   left to add, but when there is nothing left to take away." --  Antoine
   de Saint-Exupery

   "The names of global variables should start with    // "
   -- https://isocpp.org

References

   1. mailto:dave at davebiz.com
   2. mailto:wrcooke at wrcooke.net
   3. https://www.tdk-electronics.tdk.com/download/530704/6ad5ed9e1ff4f727
   4. mailto:dave at davebiz.com
   5. mailto:Coco at maltedmedia.com
   6. https://pairlist5.pair.net/mailman/listinfo/coco
   7. https://isocpp.org/
   8. mailto:dave at davebiz.com
   9. mailto:dave at davebiz.com
  10. mailto:Coco at maltedmedia.com
  11. https://pairlist5.pair.net/mailman/listinfo/coco
  12. mailto:Coco at maltedmedia.com
  13. https://pairlist5.pair.net/mailman/listinfo/coco
  14. mailto:Coco at maltedmedia.com
  15. https://pairlist5.pair.net/mailman/listinfo/coco
  16. https://isocpp.org/
  17. mailto:dave at davebiz.com
  18. mailto:wrcooke at wrcooke.net
  19. https://www.tdk-electronics.tdk.com/download/530704/6ad5ed9e1ff4f727c328cb92da2adf2b/pdf-generaltechnicalinformation.pdf
  20. mailto:dave at davebiz.com
  21. mailto:Coco at maltedmedia.com
  22. https://pairlist5.pair.net/mailman/listinfo/coco
  23. https://isocpp.org/
  24. mailto:dave at davebiz.com
  25. mailto:dave at davebiz.com
  26. mailto:Coco at maltedmedia.com
  27. https://pairlist5.pair.net/mailman/listinfo/coco
  28. mailto:Coco at maltedmedia.com
  29. https://pairlist5.pair.net/mailman/listinfo/coco
  30. mailto:Coco at maltedmedia.com
  31. https://pairlist5.pair.net/mailman/listinfo/coco
  32. mailto:Coco at maltedmedia.com
  33. https://pairlist5.pair.net/mailman/listinfo/coco