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ante

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Everything posted by ante

  1. Hi! A voltage doubler will give you higher voltage but not much usable current! I think it
  2. 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 ::)
  3. OK, suppose we have four transistors in parallel and we like to switch say10 Amp@12 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 dr
  4. Hi MP & hotwaterwizard ! I, we checked the link and it was nice reading, lots of good thinking and valuable info. But this project is a linear one and stubborn as I am :)I still state that switch mode is very different from linear. You don
  5. Hi MP. I agree to that, but even if one resistor (transistor) is smaller they are all in parallel. I don
  6. Here is an attenator for pc oscilloscope that is used for soundcard input but it will probably be possible to apply in this case. The site is in Norwegian but the schematic is pretty simple. http://home.online.no/%7Esondred/Gamle%20sider/attenuator.htm Ante ::)
  7. Here is a good place to start, containing a lot of info on metal locators. Lots of schematics and even a forum. http://www.thunting.com/cgi-bin/geotech/pages/common/index.pl?page=metdet&file=schematics.dat Good luck! Ante ::)
  8. OK, I got the hint ;D We go linear on this one. :'( Where are you Staigen! Ante ::)
  9. I have been following this project for some time now and I think all the problems with heat, SOA, big expensive heatsinks, double fans and so on can disappear by going switchmode. This is more economic, much higher efficiency, lover component count and a lot less heat. And it will fit in a smaller case too. ::)
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