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  1. C

    Voice playback

    Which chip can playback normal voice? "one" ,"two"...."three"....."nine".."ten" then can use the mircocontroller to control each one playing back Thx
  2. C

    Something about Digital to Analog Converter

    I am used a AD5678 -2 (16 bit
  3. C

    0-30 Vdc Stabilized Power Supply

    output 0V mean that common pin 3 and  short  to GOUND???
  4. C

    0-30 Vdc Stabilized Power Supply

    Thanks~~But I need add on a NEW shockky or not?? What NEW Op amp should I add on this circuit?? and pin 3 of U3 and NEW op amp connect to where??? thanks
  5. C

    0-30 Vdc Stabilized Power Supply

    o..I SEE Firstly, i should remove all the part of U1 (11.2V),Right?? I wolud like to use another control voltage reference (DAC) instead of the existing one that is used to control the current and voltage. Also...How to re-arrange the inputs of U3 and add an inverting opamp stage. Can you draw...
  6. C

    0-30 Vdc Stabilized Power Supply

    hello all I want to know the voltag range of
  7. C

    About Visual Basic6 and RS232 ASCII communication

    THX~~~But it ;s don't work~~~ someone can help??
  8. C

    +/-15V power supply using LM317 and LM337 regulator ICs

  9. C

    +/-15V power supply using LM317 and LM337 regulator ICs

    Thanks a lot~~ I need pots to adjust the output voltage because it is use for  V reference ..... My AD669 DAC Vref is given by this +-10V
  10. C

    +/-15V power supply using LM317 and LM337 regulator ICs

    +/-15V power supply using LM317 and LM337 regulator ICs How to designa +/-15V power supply using LM317 and LM337 regulator ICs. Thx The voltage is used to DAC (AD669) I have try to design the circuit.... Is it Right??
  11. C

    About Visual Basic6 and RS232 ASCII communication

    About Visual Basic6 and RS232 ASCII communication If I want to send the value (ASCII) to 8051 series port VB block input: 0.01 0.02 0.03 0.04 0.05 0.06 0.07 0.08 0.09 0.1 0.11 0.12 0.13 0.14 0.15 0.16 0.17 0.18 . . . . . . . 29.93 29.94 29.95 29.96 29.97 29.98 29.99 30.00 RS232 transmit ...
  12. C

    D to A covertor reference

    D to A covertor reference Any High Precision +-10 V Reference?? AD688 is too expensive...any other cheaper??
  13. C

    Linear Voltage Regulator Design

    Vin=40V I used the power supply to represent DAC
  14. C

    Linear Voltage Regulator Design

    I am sorry..i have try this circuit...but i don't know it 's not work.. the output is not linear and the output is disorder how to shoot it?
  15. C

    EAGLE layout Error

    why i can't open the sc,lbr and borad in other PC??
  16. C

    What is the mean of Condensation Error??

  17. C

    Linear Voltage Regulator Design

    I want to common the Opamp VCC and GND to the Vin and GND how to do that- -sorry fot my poor english
  18. C

    Linear Voltage Regulator Design

    thanks again I get a problem here... If my Vin 30 or 32V..can the output achieve 30V??? how to change the circuit...because I want to common the VCC and GND to supply voltage.... And what values of filter is suitable??? thanks
  19. C

    Linear Voltage Regulator Design

    audioguru old man, I have tied your circuit....It has some problem...... It use 15K resistor series as DAC input.... The Vref is not between 0-10V.voltage drop on the resistor Also....the output is exactly the same of Vin What is the cause??? I used the LM358 to test (Vin 36V and Gnd it)
  20. C

    Linear Voltage Regulator Design

    Thank you for your help.... Can the cirucit deliver 30V at 2A?? On the other hand, I would like to use LM358 for testing, Is it OK?? any op-amp is prefectly on this cirucit?? As I know CA3140 is 4.5MHz, BiMOS Operational Amplifier with MOSFET
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