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Zero-ohm Resistors

Discussion in 'Ham Radio Discussions' started by K4KYV, Mar 4, 2014.

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  1. KG7CSS

    KG7CSS Ham Member QRZ Page

    Where I work zero ohm resistors re used to jumper various signals and modes on engineering validation circuit boards. I often use just a piece a wire and solder bridge. In a production board they use for configuration or test. One reasons zero ohm jumps are used is a company uses the same PC board for different products for example speed and memory size are controlled by stuffing jumpers.
     
  2. K0BG

    K0BG Ham Member QRZ Page

    There is no such thing as zero resistance. Infinitely small perhaps, but not zero!
     
  3. N2EY

    N2EY Premium Subscriber QRZ Page

    "Resistance is useless!"
     
  4. PD0AC

    PD0AC Ham Member QRZ Page

    This is what the Borg said all along.

    Hans

    resistanceisfutile.gif
     
  5. K7ELP

    K7ELP Ham Member QRZ Page

    It just so happens that they can be used for current sensing or limiting. If connect a 1.6 ohm resistor between the base an a emitter of a transistor like a 2N3904 or a 2N2222 the transistor will turn when I=E/R or 0.7/1.6= .437A. It can be used as current limit for power supply, battery charger etc.
     
  6. W2JKT

    W2JKT Ham Member QRZ Page

    I use 0-ohm jumpers to give me different population options on my boards, in case I want to enable or disable features or pathways based on a parts list.

    I use sub-1-Ohm jumpers for current sensing, for adding ESR to electrolytic caps to make DC-DC converters more stable, and for many other applications.
     
  7. WA6MHZ

    WA6MHZ Premium Subscriber QRZ Page

    I have been trying to find -10 ohm resistors, but no one seems to stock them! Not even -100 ohms!
     
  8. W2JKT

    W2JKT Ham Member QRZ Page

    An op-amp can make a resistor negative.
     
  9. WB7OXP

    WB7OXP Ham Member Volunteer DX Helper QRZ Page

    when ever i encounter negative resistors, i knock em on the head a few times "right smartly", and they come around to being pretty positive
     
  10. K8ERV

    K8ERV Ham Member QRZ Page

    You don't remember the tunnel diode?

    TOM K8ERV Montrose Colo
     
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