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IndustryArena Forum > CNC Electronics > General CNC Machine Related Electronics > PSU with 2 different Output Voltages ?
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  1. #1
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    PSU with 2 different Output Voltages ?

    I have bought a Micro-Dispensing valve for a project of mine and I`m finding their Spike and Hold Driver instructions a bit confusing as it refers to two power supplies.
    The valve requires a Spike Voltage of 24vdc set for 0.3 millisecs and a Hold Voltage of 3vdc
    I am hoping to use a single power supply and would greatly appreciate being shown how to incorporate components to reduce one of the psu outputs to 3vdc.
    Is this feasable ? I`m such an electronics duh-brain

    this is the psu I have
    http://cgi.ebay.co.uk/24V-10Amp-250W...QQcmdZViewItem

    Please see the attached pics for the Driver Instructions
    Attached Thumbnails Attached Thumbnails Valve1.jpg   Valve2.jpg  

  2. #2
    Community Moderator Al_The_Man's Avatar
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    The ideal way would be of course to have a combined supply, you could use a zener circuit, simple, but not very efficient, (heat waster).
    This would consist of a 50ohm 20w resistor from a 24vdc terminal in series with a 3v 2w zener to ground, the 3v would come off the top end of the zener and ground.
    BTW all the 24vdc outputs on the supply are common to each other.
    Al.
    CNC, Mechatronics Integration and Custom Machine Design

    “Logic will get you from A to B. Imagination will take you everywhere.”
    Albert E.

  3. #3
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    Thank you very much Al
    I`ll try digest that and look for the components.

    Not too sure what you mean " 3v would come off the top end of the zener and ground"

    best regards

  4. #4
    Community Moderator Al_The_Man's Avatar
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    Quote Originally Posted by Joey View Post
    Not too sure what you mean " 3v would come off the top end of the zener and ground"
    I guess that should read Between the top end of the zener and common (ground) like this http://www.reuk.co.uk/Zener-Diode-Voltage-Regulator.htm
    You might want to add a 100µfd capacitor across the zener output.
    If you google zener resistor circuit you should find some more examples.
    Al.
    CNC, Mechatronics Integration and Custom Machine Design

    “Logic will get you from A to B. Imagination will take you everywhere.”
    Albert E.

  5. #5
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    What is the current?
    You may be able to use a simple current regulator fed with the 24 volt supply.
    The current regulator can be as simple as a transistor, diode and a couple of resistors.

    Aaron

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