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Recent content by stephen_h

  1. S

    I need help choosing proper filter for PLL design

    Re: PLL Filter Design"? The reference clock is very low and nothing concern voice and audio application, just simple RC filter is enough.
  2. S

    High Dielectric Isolation on USB port

    We want to make isolation the USB without affect its functionaity, how to do so?
  3. S

    IC Application Engineer vs IC Design Engineer

    To be honest, I like to be a IC Designer which I think to be more creative and challenage. Right now, in my country, the application engineer is considered to be a business man rather than engineer.
  4. S

    the switch power supply introduce into 50HZ/220V noise

    Check your load characteristics! If your loading is also switching load, care should be taken on control of the feedback loop of error-amp.
  5. S

    What are the main differences in hardware aspect of USB host and device?

    Hi all, I want to check that what is the main differences in hardware aspect on the USB host and device. As this catalog of component has a large diferent in pricing.
  6. S

    Wind and electricity considerations for microwave design

    Re: microwave design PSTN (Public Switch Telephone Network), how it is related to Microwave Link? Please explain?
  7. S

    What is the frequency of callwaiting in telephone system ?

    Re: callwaiting tone ??? Modern Detection is used by DSP techniques as there will have near-end voice to "jam" the Call waiting FSK signalling.
  8. S

    How to make an USB VoIP phone

    Hi, I won't like to know some information on the USB Phone. How audio integrate into USB interface? BR
  9. S

    Temporarily jamming a Camera

    RF jamming a comparative easy way, but you need to determine which is the operating frequency, we always assumed that it is ISM band 2.4GHz. But how to jam the optical signal, it is quite a very interesting topic.
  10. S

    2MHz oscilator circuit

    oscilator 8,2mhz The simplest way may be the invertor with 2MHz crystal connecting to in/out of the invertor.
  11. S

    volume controller with 8051

    Not a hard task, using 4 output ports, design the port with resistor networks which is connected to the divider. From Audio ----resistor ---- ------------------ ----> audio ouput | | | | Resistor...
  12. S

    What is the difference between these two crystals?

    Re: Which Crystal? In five years ago, HC-49/U is the cheapest one. Now it is no difference between HC-49/U and HC-49U/S. For specification, I can see that they are no difference.
  13. S

    Probing the crystal for oscillation frequency measurement

    Re: Probing the crystal for oscillation frequency measuremen Modifying the probe with inductive coupling with frequency, but it only can apply to frequency more than 10MHz.
  14. S

    interface a mobile phone to fixed line

    For software side, it is the major the AT command which is easy available from the internet. There has a special trick to deal with ACI-phone (NOKIA) because of the two-line bi-directional communications. I also look for this kind of information.
  15. S

    What is the ratio between Ropass and Resr in LDO capacitor?

    Re: LDO output capacitor I would rather know that current drain by the load. If the load is pulse load (a switching source), the capacitor value should be different. For the tantalum cap or ceramic cap, because of the low ESR in nature, the case of the unstability will be minimum.
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