Resistors, Capacitors, Zener diodes... Why the funny values?

Discussion in 'Resource Discussion' started by (*steve*), Mar 18, 2017.

  1. (*steve*)

    (*steve*) ¡sǝpodᴉʇuɐ ǝɥʇ ɹɐǝɥd Moderator

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    (*steve*) submitted a new resource:

    Resistors, Capacitors, Zener diodes... Why the funny values? - An explanation of the E-series and why those funny values are used.

    Read more about this resource...
     
    (*steve*), Mar 18, 2017
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    Arouse1973 Adam

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    It might be a bit off topic but is it worth mentioning why we have strange values of voltage references like 1.024 V and 4.096 V etc. Also why zeners have the values they have e.g. 2.4, 3.3, 5.1,7.5 and the importance of the 5.6 Volt zener.
    Thanks
    Adam
     
    Arouse1973, Mar 18, 2017
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  3. (*steve*)

    Georgy

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    Any value be needed? So in paralel you can create needed value very simply. Only but not Zener.
    Zener may be amplified to needed value. So 1024&4096 is for simplyfi calculations at ADC, DAC - there are two in the degree of N (N=10...12...)
     
    Last edited: Apr 3, 2017
    Georgy, Apr 3, 2017
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    dorke

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    A few notes:
    1. "you cant start with 0!" that is true in the "theory" of the E series,
    but a zero ohm resistor is available and very useful in many situations.

    2. The 1-2-5 series is also used in currencies denominations,
    like the Euro ,USD and many other decimal currencies .
    The main issue here is to minimize the average effort required to make change.
     
    dorke, Jun 29, 2017
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  5. (*steve*)

    (*steve*) ¡sǝpodᴉʇuɐ ǝɥʇ ɹɐǝɥd Moderator

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    1) zero is not a value in the E series. But zero ohm resistors are available as are resistors that have values not in any E series.

    2) to minimise change, a 1,2,4,8,16... series might be better. But given we have 10 fingers, 1, 2, 5 is a close estimate that repeats each decade. To maintain a fixed ratio between each range, a 1, 2.15, 4.64 if better, but makes reading values difficult. 1, 2, 5 is a close approximation. In both cases we end up with the same series, but for different reasons.
     
    (*steve*), Jun 29, 2017
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  6. (*steve*)

    dorke

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    Adam,

    1. Voltage references which are "powers of 2"like 1.024 and 4.096 may be very useful in many applications like A/D and D/A conversions,they are not "strange" at all.

    2. The voltage values of the zener diodes are about the same as the E series.

    3. Why do you think 5.6v zener is special?
    If at all,the value of 5V zener is "special".
    That is because at about 5v we switch from the zener breakdown effect to the avalanche breakdown effect.
    The importance comes from the change of the temperature coefficient from - to +.
     
    dorke, Jun 29, 2017
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  7. (*steve*)

    Arouse1973 Adam

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    Hi Dorke
    I knew the answers to these questions. It was meant for people new to electronics who may find the values strange, that's all. But thanks for answering :)
    Adam
     
    Arouse1973, Jun 29, 2017
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  8. (*steve*)

    (*steve*) ¡sǝpodᴉʇuɐ ǝɥʇ ɹɐǝɥd Moderator

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    I just so happen to have investigated some characteristics of zener diodes around the zener/avalanche voltage recently (not by personally doing experiments, but in advance of it).

    One interesting factor is that manufacturing technique (and I guess, by extension, item by item variation) can affect the temperature coefficient. What is more surprising is that the temperature coefficient is also significantly influenced by the current at which the diode is operated.
     
    (*steve*), Jun 29, 2017
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    Kabelsalat

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    Its because the values increases slightly exponentially for each step.
     
    Kabelsalat, Jun 29, 2017
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  10. (*steve*)

    (*steve*) ¡sǝpodᴉʇuɐ ǝɥʇ ɹɐǝɥd Moderator

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    I'm pretty sure you mean "geometrically"
     
    (*steve*), Jun 29, 2017
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    Edward John

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    yes they have odd values... If you’ve been around electronics for a while, you’ve probably noticed that components like resistors, capacitors, zener diodes, and inductors come in some odd values.
     
    Edward John, Jul 17, 2017
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    martin de jong

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    martin de jong, Jul 17, 2017
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