Fixed-Current Regulator


Posted on Oct 26, 2012

This fixed 1-mA current source delivers a fixed current to a load connected between Ql`s collector and ground; the


Fixed-Current Regulator
Click here to download the full size of the above Circuit.

load can be anywhere in the range from 0 to 14 . The circuit is powered from a regulated 15-V supply, and the R1/R2 voltage divider applies a 14-V reference to R3. The op amp"s output automatically adjusts to provide an identical voltage at the junction of R4 and R5. That produces 1 V across R5, resulting in an R5 current of 1 mA. Because that current is derived from Ql"s emitter, and the emitter and collector currents of a transistor are almost identical, the circuit provides a fixed-current source. The output current can be doubled by halving the value of R5.




Leave Comment

characters left:

Related Circuits

  • New Circuits

    .

     


    Popular Circuits

    12V voltage doubler circuit
    multivibrator
    arduino scanning backlight
    super psycho
    Odd application of neon glow lamps
    Push Off Push On
    AVR Projects
    A Push-Pull Hartley VFO transmitter
    Tube mic Connecting the capsule 1
    Isolated two-wire current loop circuit diagram XTR101 ISO100



    Top