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Recent content by ymq8328

  1. Y

    how much is high sawtooth in TL494 compared to input voltage

    TL494 is not a good PWM control I used the Tl497 one year ago.But the chip don't work good,maybe I make some mistake. later I find a new PWM control, at datasheetdir.com . It works. good luck.
  2. Y

    I have DIY a ARM-LPC2138 board,need your help!

    this is my first time to do PCB board usint protel. I think there a lot errors. I need you help me to pick these errors out. I hvae post the protel file at here .
  3. Y

    I need choic some sensors,where I can get these infomations?

    I am sorry. I need weight sensors. tks
  4. Y

    I need choic some sensors,where I can get these infomations?

    tell me some good web sites in this field. tks
  5. Y

    what is Rail to Rail Operational Amplifiers?

    what is Rail to Rail Operational Amplifiers? their are used in which place?
  6. Y

    I need some filter circuit design guides!

    plz send some files and free software to me. thks.
  7. Y

    current-feedback and voltage-feedback operational amplifier

    plz tell me their diffirence and how to choice them? thks
  8. Y

    how to choice a good amplify ?

    tks for your reply . but there are a lot of problems that I don't kown. can you tell me them using AD811 for a example. (I just kown 'gain' ,Slew rate). I don't kown what are current-feedback operational amplifier and voltage-feedback operational.
  9. Y

    how to choice a good amplify ?

    I am a fresh man in analog circuit. I want to kown how to choice ampify. please tell me something that must be noticed 。
  10. Y

    there are some body who kown hou to use AD9764?

    what these mean in datasheet" Measured at fCLOCK = 25 MSPS and fOUT = 1.0 MHz. 7Measured as unbuffered voltage output with IOUTFS = 20 mA and 50 W RLOAD at IOUTA and IOUTB, fCLOCK = 100 MSPS and fOUT = 40 MHz."
  11. Y

    how to realize a SPI interface with VHDL?

    spi slave vhdl but it is realize in verilog, not in vhdl
  12. Y

    how to realize a SPI interface with VHDL?

    spi vhdl how to realize a SPI interface with VHDL? I find it is too difficult for a newbie. need your help .
  13. Y

    what is the diffirence between bit and std_logic In vhdl?

    I am a newbie in this field . I wiil use std_logic all the time, is this a good choice?
  14. Y

    what is the diffirence between bit and std_logic In vhdl?

    std_logic *.pdf I see. but why people prefer std_logic to bit,
  15. Y

    what is the diffirence between bit and std_logic In vhdl?

    std_logic in vhdl what is the diffirence between bit and std_logic In vhdl?
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