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Everything posted by ante

  1. Oh, I forgot: Here are some datasheets for the nearest brother and for the equivalent one. By the way the 2SD2064.pdf
  2. Hi, John I found the info in a book, and now I found it on the net also: http://perso.wanadoo.fr/pouzou/site/composants/sd/2s2000.htm Good Luck! Ante ::)
  3. Hi, You can try http://www.cmbcomponents.com/ Ante ::)
  4. Hi mastrila, Do you have the variac directly between mains and your PSU circuit? If so is the variac you are using a full transformer model? Ante ::)
  5. A great place for manuals and bulletins covering lots of different equipment: http://www.wimtv.be/techniforum/ Ante ::)
  6. Hi mastrila, If C7 gets hot you probably got oscillation. The only way C7 can get hot is if it
  7. Must be some [glow=red,2,300]BIG[/glow] crystals if they are used to charge batterys. Ante ::)
  8. Hi gaark. I have seen a PSU that was equipped with a triac regulation on transformer primary. The way they done it was using a dual potentiometer for the voltage control, not a closed loop. The set-up was about 8 volts difference with no load. I think if you want a closed loop control you have to use a digital potentiometer with
  9. I believe the filtered output is a necessity because the way switchers work. They shop the current at 40 to 100 kHz (sometimes more) and create spikes and some interference that must be restrained. Ante ::)
  10. Ok, I have missed it then, what is the chip id please? Ante ::)
  11. Go to http://www.doom.com/results_sample.asp and type in SPCA711A. Ante ::)
  12. Hi. bogdan. The energy in this is very low; I don
  13. If you only have 2 volts, what
  14. Hi. Try this one, hope it's the right one! http://www.searchdatasheets.com/search.asp?q=29W320&t= Ante ::)
  15. Hi Hope this will help you. http://www.casio.co.jp/ced/english/pdf/E_PDF/model/T1151.pdf. Ante ::)
  16. Hi. I think C2 and C3:s connections should be as short as possible and be located closer to the regulator. Ante ::)
  17. Sorry. All white led:s I have seen so far are 3.6V drop so 5 Volts will to fine. Unless it was 2.5 V stated in the question instead of 2 - 5 Volts, as I believed. Ante ::)
  18. Why use a chip for this, just a couple of resistors will do the job. Ante ::)
  19. Hi! A voltage doubler will give you higher voltage but not much usable current! I think it
  20. MP, OK, there are some things I still not agree on. One example: how can a 10Amp load suddenly pull 100Amps through one transistor even if the transistor should be shorted?? I must have a lot to learn about this. But because this is not the right forum for this I rest my case. I am also interested in the outcome of this inverter but I will not question the construction again. By the way, the link did not contain any info on switching transistors. Thanks. Ante ::)
  21. OK, suppose we have four transistors in parallel and we like to switch say10 [email protected] Volts. The transistors are not exactly the same (not from the same batch) but we want to use them anyway. The first has 0.2 V drop the second 0.3 the third 0.25 and the last 0.25. This does not mean that all the current runs through the first one whit the lowest resistance sins they are all in parallel. If we add resistors to each one of the transistors we also add further drop (0R1 X 2.5A = 0.25V) if the transistors had been equal. Can you explain the reason for the resistors by adding info on the following drawings, please? Sorry for being a pain in your neck, but I think debating things like this is very stimulating. Just stop me when I become too much! ;D The (Swedish) mule! Ante ::)
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