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Constant current (or voltage) source WITHOUT semiconductors?

Discussion in 'General Electronics Discussion' started by NuLED, Jun 27, 2016.

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  1. NuLED

    NuLED

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    Jan 7, 2012
    Hello - Is there a way to provide constant current (or voltage) without using ICs or even transistors?

    I would expect a lot of energy lost through heat, from analog current and voltage division (or maybe not?) but what about the feedback system to maintain the constant level?

    Thanks.
     
  2. Bluejets

    Bluejets

    4,492
    957
    Oct 5, 2014
    Look at the older DC generator systems on automotive charging circuits.
     
  3. Alec_t

    Alec_t

    2,927
    797
    Jul 7, 2015
    Saturable reactor / magnetic amplifier?
     
  4. Ratch

    Ratch

    1,091
    333
    Mar 10, 2013
    Sure, it is easy to do. Suppose you want to build a 10 ma constant current DC current source. Find a 100 volt DC supply. Then insert a 10k resistor in series with the voltage.source. Now you have a 10 ma current source that will use 100 volts to assure that 10 ma exists. If that is not enough, then higher voltages and resistances can be used.

    Ratch
     
  5. BobK

    BobK

    7,682
    1,687
    Jan 5, 2010
    A battery makes a pretty good constant voltage source.

    Bob
     
  6. (*steve*)

    (*steve*) ¡sǝpodᴉʇuɐ ǝɥʇ ɹɐǝɥd Moderator

    25,476
    2,820
    Jan 21, 2010
    you could also build a circuit with valves!
     
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