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Recent content by rezaxyz

  1. rezaxyz

    Constant Current Supply to Voltage Regulator

    @pradeep.g.belchada: How can I do it? The circuit output should maintain constant voltage instead of current. @crutschow: “What you show is a constant voltage output regulator, not a constant current.” Yes, the main source is constant current and desired output is regulated dc voltage...
  2. rezaxyz

    Constant Current Supply to Voltage Regulator

    Hi all, In your opinion is it possible to use a constant current source (i.e. LED Driver) as a digital circuit power supply (like attached schematic)? current source specification: Pout=3W, Isc=200 mA, Voc=20v and the desired regulated voltage is 5V, 100mA. Thank in Advance, Reza
  3. rezaxyz

    Body diodes or active Freewheeling?

    Hi all, In your opinion why in this AN they did not use freewheeling diodes for MOSFETs? **broken link removed** Is it because of body diodes of MOSFETs or actively freewheeling by brake state? Regards, Reza
  4. rezaxyz

    Why ARM GPIO pins are not aligned?

    Hi all, In your opinion why ARM microcontrollers (like LPC2000 and AT91SAM7) GPIO pins are spreaded and are not aligned like 8-bit microcontrollers? how can I overcome this problem with minimum overhead? Thank in advance, Reza
  5. rezaxyz

    Looking for the Spice model of LM565

    Re: LM565 Spice model Hi, I need it too, please help :|
  6. rezaxyz

    Which tool can simulate MC1496 ?

    Re: pspice model mc1496 Hi, How can I use this model in PSpice? Thanks
  7. rezaxyz

    a function in codevision AVR for drive PS2 keyboard

    ps2 drive avr Hi, you can find it here: https://www.eca.ir/forum2/index.php?topic=12758.0
  8. rezaxyz

    WHY PIC not AVR - your opinions

    WHY PIC I think Atmel has rejected Microchip 2.3 billion $ suggestion. Added after 1 minutes: AVR's architecture is very interesting and powerful but Microchip documents and supports is better.
  9. rezaxyz

    USART question - start/stop bits

    USART question Hi dear friends, I am interested to know why a character must be framed by start and stop bits in USART's synchronous mode, despite the receiver can be synchronized with transmitter by an external clock line. Thank in advance, Reza
  10. rezaxyz

    Transistor as a switch- configuration of BJT to driving LEDs

    Transistor as a switch Hi dear friends, In your opinion what's the best configuration of BJT to driving LEDs (DotMatrix, big 7-segments, …) ? Why common-collector is not suitable for switching heavy loads? Is there any AN or reference to study more about this subject? Regards, Reza
  11. rezaxyz

    beta and fT of “Lateral PNP transistors”

    Hi dear friends, Why beta and fT of “Lateral PNP transistors” is lower than “Lateral NPN transistors” ? Thank in advance, Reza
  12. rezaxyz

    Reflection on SPI bus

    spi series resistor Thank you FvM, I used point to point topology, how can i terminate the lines? is there any reference about this subject?
  13. rezaxyz

    Reflection on SPI bus

    spi termination Hi all, I need to use SPI bus on a big Printed Circuit Board (width: 70 cm). Near master microcontroller, there is a SPI DataFlash chip which must be accessed by full speed of AVR's SCK line (8 MHz). Now I routing PCB and I am worry about refection on bus when master accessing...
  14. rezaxyz

    Where is the I²C bus in OSI model?

    Re: I²C in OSI Model Thank you so much.
  15. rezaxyz

    Where is the I²C bus in OSI model?

    Re: I²C in OSI Model Thank you CMOS, I think so. In your opinion the term "Address Packet" is correct about I2C bus? (See attached image which is from AVR manual)

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