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Recent content by wanchope

  1. W

    interface to G3 fax machine

    Hi, I am very new to fax interfacing. Now I have a data terminal consists of an embedded microcontroller and a data modem. What do I need to make the terminal support G3 fax, i.e connecting through an RJ11 cable, sending and receiving fax. I heard I need a SLIC, a DTMF decoder, an FSK...
  2. W

    watchdog with long delay

    I used the function gen for the 0.5hz pulse. When i removed the clock input physically, the circuit works. But if i just switch off the function gen (leaving the clock pin intact), it does not. I have another test again to confirm. At first I give a pulse at the clock input (pin 2), then ground...
  3. W

    watchdog with long delay

    Thanks, Laktronics. I built the circuit today, and found one mistake. When the MCU hangs and the heartbeat pin stays at low, reset is not happening. Any clue?
  4. W

    watchdog with long delay

    Thanks. Attached a possible circuit. But I foresee one problem. If the system hangs at the very first time, ie. no heartbeat pulse at all, this circuit will not generate the reset pulse. Any comments?
  5. W

    watchdog with long delay

    picaxe Hi, I found one of my microcontroller systems hang from time to time. When it hangs, I need to remove the battery and wait for 20 seconds for the capacitor to drain. After that, I connect back the battery and the system will work again. I would like to design a hardware watchdog with...
  6. W

    Solution to interview question about clock circuits

    Re: interview question Can a '555' do this? How should I connect the trigger pin?
  7. W

    Solution to interview question about clock circuits

    Re: interview question I also thought it should be counter circuit. Any good example?
  8. W

    Solution to interview question about clock circuits

    Re: interview question Thanks all for your reply. There are 2 more conditions 1. it may not be necessarily 16 clock cycles. What if 15 or 14? 2. The pulse width of clock in Diagram A is 50ms 3. The duration of B is around 15-20 seconds. Therefore RC may not be a good idea.
  9. W

    Solution to interview question about clock circuits

    Hi, all, I just been to a company for a hardware eng position interview. There is one digital design question as illustrated in the attached picture. Can anyone think of how to design a circuit that can transform from 'A' to 'B'? regards
  10. W

    What will be the voltage level between the two capacitors in this schematic?

    What will be the voltage level between the 2 capacitors? The Vcc = 10v DC. Anyone know how to explain this? regards Wanchope
  11. W

    USB 1.1 to 2.0 converter

    Hi, all, Is there such a device (IC) that can converter my USB host 1.1 into 2.0 version? Please advise. Wanchope
  12. W

    how this circuit works?

    Thanks. But how exactly the change of state happens? Can you provide some operation conditions for the 3 BJTs? regards Wanchope
  13. W

    how this circuit works?

    Hi, all, I found one circuit for multiple antenna detection. But I do not understand how it works. Can anyone help to explain? How V1 and V2 behave when the current source's current increase? Thanks.
  14. W

    Set top box development cycle

    Hi, all, Anyone here is familiar with set top box development cycle and the development cost? Now this is a hot industry. I just want to make sure i do not underestimate the effort put in for such a product. What is the significance of middleware? regards wanchope
  15. W

    Recommend me a CDMA module

    CDMA module Hi, all, Any CDMA module to recommend? My basic requirement: Operating temperature: -20-85 degree cel size: <40*40*5mm Please advise. Wanchope
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