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Recent content by chmr

  1. C

    comb generator circuit ?

    Dear all, I want to build a comb generator,and the frequency is 10MHz step up to 1GHz, Is there any reference circuit ? thanks~ chmr
  2. C

    Battery charge or not ?

    Thanks for your reply,but that is not I want, Users may put different type of battery, maybe alkaline or maybe NiMH....,some of them are rechargeable and others are not. The circuit that I want is to distinguish from them.
  3. C

    Battery charge or not ?

    Hi all: I want to design a circuit that to determine if the battery is chargable,then shows in LED. That is ,I can maybe put alkaline , carbon-zinc or NiMH battery ..... But I have no idea how to start,anyone can help me ? Thanks
  4. C

    Where can I find data about RCC circuit ?

    adaptor rcc design RCC: Ringing Choke Circuit
  5. C

    Where can I find data about RCC circuit ?

    Hi all Where can I find data about RCC circuit ? I need to design a adaptor with 5V output. Thanks a lot -------------- chmr
  6. C

    How to start designing an AC to DC power supply?

    Re: AC to DC ? Thanks all The circuit that I post was my boss give,but it can't work,the MOSFET is not switching.It seens there has some problems in the photo coupler circuit. Can anyone tell me how to modify the circuit,but the only and most important is "cost". Thanks a lot...
  7. C

    How to start designing an AC to DC power supply?

    Re: AC to DC ? Hi Ianp I found a circuit,is it the same with you gave ?
  8. C

    How to start designing an AC to DC power supply?

    AC to DC ? Hi all I want to design a AC to DC power,but I have no idea how to start,is there any related data or reference circuit ? AC input : 85V ~ 250V DC output : 4.5V ,1A Thanks -------------------- chmr
  9. C

    Why the output voltage remains normal in discontinuous mode?

    Discontinuous mode ? Hi all I have a question about switching power... In buck circuit, why the output voltage still remain normal even in discontinuous mode ? Can anyone explain it in detail ? Thanks ------------------- chmr
  10. C

    Is 8bit MUC enough for my system?

    Re: Is 8bit enough? Hi Ianp Do you mean that after ADC complete,it might be "waste" some times then be delivered to the UART? That is exact I worried. My DSP need to have fast response to do something after press the keys. Will it be delayed by UART ?
  11. C

    Is 8bit MUC enough for my system?

    Re: Is 8bit enough? ADC clock is 2MHz,and 8bit or 10bit can be chose.
  12. C

    Is 8bit MUC enough for my system?

    Is 8bit enough? Hi all I have a 8 bit MCU in my system,most of the signals are used as GPIOs,and there are 5 ADC be used as key detect. Because the MCU is connect to DSP through UART, I'm afraid that response of the keys will too slow. Is it better to use 16 bit MCU,or doesn't matter. Thanks...
  13. C

    What is the concept of phase margin ?

    phase margin What is the concept of phase margin ? And the meaning of "zero" and "pole" ? Please describe in simplify Thanks ------------------ chmr
  14. C

    What is the compensation network used for ?

    Re: Compensation network ? Sorry that unclear The compensation network is used in switching power It looks like a feedback from output As I said , there are three different types , but how do I decide which one I can use ? Thanks ------------------ chmr
  15. C

    What is the compensation network used for ?

    Compensation network ? Hi all What is the compensation network used for ? There are type I ,II and III, what's the difference ? Thanks --------------- chmr
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