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neo_himura

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Posts posted by neo_himura

  1. 0-30 Vdc Stabilized Power Supply

    in Projects Q/A

    Posted


    Leave R7 at 0.47 ohms. 3A through 0.47 ohms makes a voltage drop of 1.41V. If the meter is 200mV full-scale then it needs an attenuator.
    If the internal resistance of the voltmeter plus its series calibration resistor is only 47 ohms or less then the calibration will be affected.


    my voltmeter has range of 0-30VDC and a full scale current of 27.5mA.
    what is the value of series resistor should i put to convert it into an ammeter with 0-3A range..?

    thanx

  3. 0-30 Vdc Stabilized Power Supply

    in Projects Q/A

    Posted

    hi,
    thanx audioguru..

    Now.. I have a analog voltmeter.. can I use the same meter to display voltage and current using a switch to switch between voltmeter and ammeter?
    cause i know that a voltmeter can be converted into an ammeter by adding a shunt resistor..
    how do i calculate the resistor value?
    thanx

  4. 0-30 Vdc Stabilized Power Supply

    in Projects Q/A

    Posted



    Make a two-resistors voltage divider of the 40.4V to reduce it to about 13.2V, then feed it to a darlington power transistor as an emitter-follower to drive the fan. The transistor will provide plenty of current for the fan to start if the current in the resistor divider is high enough.


    Sorry, i'm a newbie...
    can u please include the circuit with the values?..i'm not sure how to connect it.. and what kind of Darlington power transistor sould i use?
    is 2n6036 ok?

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