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I need help determinig correct voltage.

Discussion in 'General Electronics Discussion' started by Martin Rodriguez, Nov 2, 2017.

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  1. Martin Rodriguez

    Martin Rodriguez

    Oct 30, 2017
    I have a device that I took off an Avermedia document camera, It has 4 lasers and bright white LED's I would like to power it with batteries, but how can I find out how much voltage is need it?
  2. kellys_eye


    Jun 25, 2010
    Show a picture of it.

    The voltage is 'fixed' according to the type of device but its current requirement is quite specific and can't be guessed at (safely).

    What do you want to power? The LED or the lasers? Sure they're lasers?
  3. Martin Rodriguez

    Martin Rodriguez

    Oct 30, 2017
    See I'm powering it with a 9v battery, but I don't know if I'm giving it the correct voltage I really don't want to fry the LED's.

    Attached Files:

  4. kellys_eye


    Jun 25, 2010
    Seems as if the LEDs have some form of current limiting and/or control on the lower circuit board. Do you have any idea what the original supply voltage to the equipment was?

    I suspect there will be a voltage regulator in there somewhere as the LEDs 'look' to be lit appropriately - just connecting a battery across them could damage them. The 'lasers' (if that's what they are) would require additional control - again seemingly part of the lower circuit board???

    Potentially some control components on the reverse of the top board too???
  5. AnalogKid


    Jun 10, 2015
    What was the battery voltage for the camera?

  6. Cannonball


    May 6, 2017
    I see that you were running it with a 9 volt battery. Open the circuit at the positive terminal of the battery and
    insert an amp meter to read the current. Compare this with the specs of the LEDs and lasers. If this is to much
    current, take the difference of what you read from what the specs are. Divide this into 9. Install a resistor of this
    value into the circuit. That is what I would do if it were me.
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