Search results

  1. trigger

    Motorola's circuit doesn't work.

    Have you check the output of your circuit to see if it really TTL signal or a ruined signal?
  2. trigger

    Infrared Receiver

    A carrier will help to transmit further
  3. trigger

    CRO

    and then?
  4. trigger

    What is holding switch mode PSUs back?

    I think it is about the money! Say for example, a tradition 12V DC adaptor is around US$1.2 while a smps is 2 to 3 times or more in the cost, so as the importer or as customer, what will you choose?
  5. trigger

    battery and HDD

    HDD needs stable voltage and I think LM317 is not appropriate in supply voltage to your application, esp. you can't guarantee the resistors values are stable.
  6. trigger

    PCB Stuff....

    They are the substrate or say the materials used inside the PCB. For finished copper weight, if you are working on RF, the thickness of copper will affect the dielectric coefficient of the PCB.
  7. trigger

    Paralell resistors

    Ohm's Law......
  8. trigger

    Shrinking heat-shrink sleeves

    I will use solder iron to make them shrink, if I don't have the heat gun
  9. trigger

    WinRar

    You can use Izarc instead of winzip and winrar. www.izarc.org It is a freeware, so enjoy the "free" stuff.
  10. trigger

    Identfier and tracker Please look

    I think RFID solution will fit your need.
  11. trigger

    0 ohm resistor

    What I know is, some products keep a resistor footprint for adding EMC components for Lab test while they will use a 0ohm resistor for shipment product...... what for...... reduce cost  :P
  12. trigger

    Is bluetooth safe?

    Or simply say, don't use an RF transmitter near your head :P :P
  13. trigger

    0 ohm resistor

    It acts like a small inductor in some cases.
  14. trigger

    Is bluetooth safe?

    Sure, RF's influence in human's health still not determined. Who knows..... But one thing is, if I have a child, I will not use any RF devices near him/her. There is also some similar product to bluetooth, like zigbee. But I don't think it will be another technology trend. I am waiting for...
  15. trigger

    Plz help me in understanding this RF reciever

    If it has a crystal, it is a superheterodyne receiver with local oscillator, typically 10.7MHz. It is much stable than the super-regenerative receiver. But I can tell if the layout and circuit is fine-tuned for the regenerative circuit, it won't do any significant differences in performance...
  16. trigger

    shake light

    Is that "shake" charging torch?
  17. trigger

    Simple question about measuring output of a wall mount transformer...

    It is normal, you are measuring the off load voltage and it will be higher than the rated voltage.
  18. trigger

    Video Assist

    Try to give a 75 ohm load as some instrument need a loading. If it still not working, try to pass video signal through a capacitor. Hope this help.
  19. trigger

    audioguru, question on preamp/amp

    Also need to take precaution on the input capacitor, as it will affect the input signal.
  20. trigger

    help with blue led

    You can try using a transistor at the 555 output pin for switching and tie the blue LED  to 6V with a resistor.
Top