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  1. Kain

    SERVO THROTTLE SIGNAL

    I figured it out. The trottle signal is only for speed control purposes. The motors normally spins in one direction only. Thus, if we want it working in reverse direction, the motor control has to be programmed with the corresponding instruction. Either way - it cannot be done on the fly with...
  2. Kain

    Driving IGBTs

    I want to build an H-Bridge with IGBTs since I got quite some here and I'll be switching about 15A. Now, the low side of the H-Bridge is easy to drive since potential that appears on the gate is basically the same as Vge assuming that I connected E directly to GND. However the high side is a...
  3. Kain

    SERVO THROTTLE SIGNAL

    Um, reverse the connections? We are talking about brushless motor not brushed... I don't think this will have any effect on the direction of rotation. Maybe it's a software adjustment or something...
  4. Kain

    SERVO THROTTLE SIGNAL

    Nice, but then how does one reverse direction?
  5. Kain

    SERVO THROTTLE SIGNAL

    Wow, it's been a while since I visited the forum  ;D, but anyways. I got my hands on a brushless DC motor as well as the controller for it and I wanted to use it for a non-RC model applications, so obviously in order to drive it I will need to emulate the same signal as the one a receiver is...
  6. Kain

    Convert 0-30V 3A PSU to 5A or more

    Somebody here asked about the parts that I used to build the PSU. I'm sorry that I respond quite late but I've been really busy lately with FPGAs... About the parts - Audioguru is right. I used the modified list for 5A. The power resistor is actually 15W and it's mounted on the PSU case. Smaller...
  7. Kain

    USB to LPT Adaptors

    Hi Zombie! I hope you don't mind pasting the URL  ;D
  8. Kain

    USB to LPT Adaptors

    Ok, it seems nobody knows anything about it at this point. I checked things myself and it comes down to the point that USB to LPT can be used only for specific purpose of printing and it is not guaranteed to work with all printers either. In other words if one needs to expand a newer PC with LPT...
  9. Kain

    IGBT and MOSFET drivers???

    Ok, so what you meant is that the driver chip is switching on and off the IGBT/MOSFET more efficiently as well as providing for "dead time" when reversing directions. Would you recommend any IC in your experience? Thanks again  ;D
  10. Kain

    IGBT and MOSFET drivers???

    Thanks Audioguru! Can you schematically show what you mean by saying that one MOSFET is connected to the other? I thought that they need to be both "on" if they are to conduct the current through the motor
  11. Kain

    IGBT and MOSFET drivers???

    Hi again everybody
  12. Kain

    USB to LPT Adaptors

    I just received my FPGA board from Digilent and besides the fact that it looks nice I noticed something that I don't like at all - it came with LPT programming cable. Well LPT is a dying standard as we can all see - new PCs or laptops don't even have one anymore and this is my case, as well. The...
  13. Kain

    EPROMs and "Don't Cares"

    Ok that sounds bad now. So virtually I have to describe all situations where don't cares will normally simplify the situation... That just made my code close to 4000 lines...  :'(
  14. Kain

    EPROMs and "Don't Cares"

    I am really curious if EPROMs or EEPROMs allow for "don't care" conditions. Any ideas?
  15. Kain

    Convert 0-30V 3A PSU to 5A or more

    Thanks MP
  16. Kain

    Free sample chips!

    Thanks MP. I got them in friday afternoon so everything is alright now  ;D
  17. Kain

    Free sample chips!

    Has somebody here ever ordered samples from Linear Technology? I ordered few chips from them and I got confirmation on my e-mail but nothing in the mailbox yet. It has been a week. Maybe I'm not patient enough, eh? ;D
  18. Kain

    Convert 0-30V 3A PSU to 5A or more

    Thank you both Audioguru and Ante, and Ante you are right - I did put quite some time into it. I love the results though  ;D
  19. Kain

    Convert 0-30V 3A PSU to 5A or more

    Ok, here are pictures of the completed PSU. It is now set at 12V on both sides as one can see on the picture. The fan on the top cover is pushing air in the case causing circulation. The air gets out from both sides - left and right as it cools down both h/s. The fan is actually temperature...
  20. Kain

    Convert 0-30V 3A PSU to 5A or more

    Alrighty, I assembled the machine and it is fully operational now. The unit was tested again 3 days ago in my university and the results were more than satisfying - ripple under 6A load was merely 2mV and I am not sure if that wasn't partually scope noise. On any other working modes the ripple...
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