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Recent content by 5arid

  1. 5

    simulating center tapped transformer

    I want to simulate this circuit : I found a datasheet for LT700 and used its parameters but no sound is generated in Proteus simulation.
  2. 5

    simulating center tapped transformer

    I want to simulate this transformer in Proteus : Please help me to calculate the missing values :
  3. 5

    Need old ISE version

    It is not a full installer, it is just a service pack!
  4. 5

    Need old ISE version

    I am trying to use XC9572 but because of this problem I can't use it : http://www.blunk-electronic.de/ise/howto_erase_XC9500.pdf I need an old version of ISE 3.3 or before than that. Thanks in advance
  5. 5

    CPLD USB Jtag Programmer

    I found some interesting links : Archive of files (FTP) : http://sa89a.net/ele/ub/ Russian Tutorial : http://we.easyelectronics.ru/plis/usb-blaster.html ALTERA --> Quartus Lattice --> XP2Write **broken link removed** Xilinx --> urjtag (?)...
  6. 5

    8x8 Dot Matrix LED pull up resistors?

    Am I close to it?
  7. 5

    8x8 Dot Matrix LED pull up resistors?

    So I have to use lower resistor for current limiting? 5v Source voltage 2v diode forward voltage 25 * 64 diode forward current (mA) So according to www.ledcalc.com : R = 2.2 ohm 5 wat Is this right?
  8. 5

    8x8 Dot Matrix LED pull up resistors?

    What do you mean? What is wrong with my design? Thanks for introducing it Will this work?
  9. 5

    8x8 Dot Matrix LED pull up resistors?

    How about this one :
  10. 5

    8x8 Dot Matrix LED pull up resistors?

    I am controlling LED anode with EPROM and LED cathode with 238 : EPROM --> Buffer --> Anode 238 --> Driver --> Cathode But it seems that it is possible to swap the cathode and anode circuits : 238 --> Buffer --> Anode EPROM --> Driver --> Cathode Which setup is better? Is there any difference...
  11. 5

    8x8 Dot Matrix LED pull up resistors?

    one of my friends suggested to connect /OE (EPROM) to Q3 (Counter2:B) But as I tested I didn't notice any change. Is there any advantage with that?
  12. 5

    CPLD USB Jtag Programmer

    I found this project but unfortunately it is in Japanese : **broken link removed** Fortunately someone explained briefly in English about it, but unfortunately the links to the pictures on how to configure PIC18F2550 are dead! : **broken link removed** Can anyone find out what configuration...
  13. 5

    8x8 Dot Matrix LED pull up resistors?

    How about this one : Added ULN2803 Added pull-up resistors Replaced 138 with 238 (for inverted output to be used with ULN) Will it work? Any other suggestion?
  14. 5

    8x8 Dot Matrix LED pull up resistors?

    There is also another problem with my design : The LEDs are not bright enough. How can I fix it? By the way I am using 150 ohm for current limiting resistors.
  15. 5

    8x8 Dot Matrix LED pull up resistors?

    I designed a 8x8 Dot Matrix LED : And here is the schematic : It works fine. But I see that in some other schematics there are pull up resistors : Do I need those pull up resistors? Thanks in advance
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