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Posts posted by trigger

  1. Ante,

    I am using XP professional SP1. Problem..... already solved by reinstallation. But really, if XP are in trouble, it is very painful to recover it.
    I do agree WIN2000 is very good and stable....
    However I think most stable one will be DOS6.22 + Windows 3.1 era..... :P


    Ok, boot from CD-Rom then
  2. the marking on the battery is showing mAH, i.e. milli-ampere hour.

    By dividing it with the current drawn by the unit, you can guess how much hour your unit can use (for the battery is fully charged)

    So it needed not a supply to give out 800mA for your application.
    Just a simple regulator circuit will do.

  3. Ante, noope, I am not giving up.
    For example, recently, my computer (windows XP) mess up with some dll file corrupted. Even I try to perform a system restore or start on a safe mode can't success.... i.e. can't bootup windows....

    thus my way is to reinstall it..... without another choice.
    of course if I am not lazy I can have a backup using Norton Ghost.... :P


    I think you just give up to easy!


    I am very happy with Norton but I never use NTFS, it is too much pain when shearing files.

  4. if it is just a sound activate door opener, then you can use a relay and a electronic lock and a sound activate circuit.

    However, if you want to have voice recognition, it will be a much more difficult one. It will be another issue. Most likely, you need a fast processor or even a PC to do so.....

  5. Here is the draft circuit diagram of the repeller I have.
    Hmm.... it just buzz.... and I heard the sound....... :P
    I can't guarantee it works on repel mosquitoes...... it is just for fun only..... and I haven't rebuild one myself......

    The NPN transistors are SMT components which marked L6, I haven't check its part number but I believe it is from On's Semi.

    The coupling capacitor C is 1000pF where I haven't put its value in the schematic...

    And the switch is for select high or low buzzing frequency....

    So if any of you have build it and test with a mosquitoe, then let us all know about its performance.



  6. Ok

    The iron I`m using is a 25Watt one but I remove the "hooter" of the iron and I put a 1.5mm thick copper wire without the isolation sharpen in the end.That`s how I usually solder these components.

    I have experienced with electronics very much but I haven`t had such a problem until now.

    It is a nice idea but the copper wire will stick with solder and may mess up your work......

    My experience is to use sharp solder iron (25W is fine) + thin solder (0.6mm) + tweezer + solder paste , then everything will be nice. But somehow beware of the solder stick to adjacent components' pads.
  7. As I am in Hong Kong, I think most of the IC manufacturers will forward the sample order to the distributors in Hong Kong......... and I do think most of them are not willing to send samples especially we are for our own usage.... :-\

    I haven't give an order yet.....hmm....... may be I should try Microchip first....... ;)

  8. Thanks for reply.

    I can tell you that I am currently working on digital tuning system, that is, a PLL+VCO. However, it is quite different from that of manual tuning using capacitor, esp. matching RF coil part.

    I know that for radio sensitivity, mostly it related to circuit layout and component placement.... but I just hope to find an effective way to reduce the trial-and-error time. ::)

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