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Everything posted by ante

  1. Rhonn, I have heard from people how have had success with these things, but they are in the frequencies that you can hear yourself (2200 to 3500Hz). So it is a question of who can stand it the longest you or the mosquito
  2. Jeff, Welcome to this community. Something similar happened to me with a projector, not the same brand but anyway. I found out that the problem was the cable from my laptop to the projector that was faulty. I hope this helps. Ante ::)
  3. coder, The battery voltage (12.7V-5V) * 1.3A = 10W of heat, this needs a good heatsink. I hope you are aware that this circuit have no over current protection! I recommend you to make a modification to be safe. Like this: Ante ::)
  4. Coder, As far as I can see the circuit is OK as you have drawn it. I have to ask: what is your input voltage to this circuit? Ante ::)
  5. Kevin, The output side of the regulator is monitoring the output voltage and feedback to control the transistor is produced in the BE resistor. Ante ::)
  6. Kevin, If using very low currents it is possible to use zeners and resistor dividers, but otherwise it is a very "lossy" way to go. You must have some idea of the current needed nA, mA, hundreds of mA or A. And of curse the voltages involved. An interesting thing is if you can use common ground (negative) for all the voltages or not. Ante ::)
  7. Kevin, The transistor is not backwards! Here you can see how the boosting regulator is calculated: Ante ::)
  8. To All, To minimize the temperature in the power stage it is important to have fast rise and fall times =(nice looking square wave). There are two ways to go with the choice of frequency. One is to calculate the optimal frequency for the motor used, second to use a high frequency like 15
  9. Kevin, A low value resistor tap or a Zener circuit could hardly be an optimal way to go. What voltages and currents do you need and in what kind of environment is the circuit suppose to
  10. Darrin, Have you checked here: http://www.intertechnology.com/Vishay/pdfs/Catalog_500A.pdf Ante ::)
  11. AJB2K3, Thanks for letting us know! Ante ::)
  12. Coder, Is it possible that you have swapped the PNP transistor for a NPN? Ante ::)
  13. Rhonn, Can this be what you are looking for? http://www.kemo-electronic.de/en/bausaetze/b005/index.htm Ante ::)
  14. Sorry, I believed it was a mistake curse I don
  15. ante


    ;D Greece Are European Champs! ;D Congratulations Greece a well deserved victory! I will not comment on the Swedish team. :-X Ante ::)
  16. Greg, Welcome to this community. I assume you are using an analogue meter since you want a 0
  17. audioguru, Take a look at the power transistor data sheet. The SOA tells me they will cope as they work in pairs it is possible to get 0.1 V @ 5A with a good heatsink. Am I right? Ante ::)
  18. Hi All, I found an article about a Lab power supply. It
  19. audioguru, The first point, only under certain condition it can be true. If the current draw is high and there is a voltage drop the motor looses some of it
  20. suresht, These links will give you a start. http://www.arcelect.com/lightnin.htm http://www.taunton.com/finehomebuilding/pdf/Lightning.pdf http://www.hq.usace.army.mil/ISD/YellowPages/info/lasps.html Ante ::)
  21. Thrival, I am having a hard time interpreting the schematic. Is this the original schematic? I can
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