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Lamp Replacement on Equalizer

Discussion in 'General Electronics Discussion' started by Rick79, Oct 21, 2017.

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  1. Rick79

    Rick79

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    Nov 26, 2014
    I have a yamaha EQ-630 with both back light bulbs blown. Theres no information on the voltage or amps written on the bulbs and nothing written on the circuit board. My question is, can these be replaced with LEDs? If so, would i need to use a resistor?

    Thanks
     

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  2. dorke

    dorke

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    Jun 20, 2015
    These are usually AC lamps 6.3VAC or 8VAC ,current may be around 100mA
    Put your meter to work and measure the voltage.
    It can be replaced by a LED but you need to rectify the ACV first.
     
  3. Rick79

    Rick79

    283
    5
    Nov 26, 2014
    Thanks. I measured the Voltage, Im get 16.39 VAC.
    If i know the correct Voltage of lamps to use i would like to go find some. Then if i dont have any luck, i can probably build something for using LEDs.
     
  4. dorke

    dorke

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    Jun 20, 2015
    Rick,
    you should measure with a load .
    do you have any 100mA lamps?
    note that you can connect 2 low voltage(3V,4.5V etc.) lamps in series.
     
  5. Rick79

    Rick79

    283
    5
    Nov 26, 2014
    No, i dont have any lamps like that. I just have those LED lights that you plug into USB ports for power. Is it possible to just tap into a 5V rail somewhere and use the USB lights instead of building a rectifier?
     
  6. Alec_t

    Alec_t

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    Jul 7, 2015
    One thing to consider with LEDs is beam angle. They are usually quite directional, whereas a filament bulb has a broad spread of light. So you may well need either a LED array or an effective light reflector/diffuser.
     
    Rick79 likes this.
  7. dorke

    dorke

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    Jun 20, 2015
    It is possible to tap into a low voltage DC rail and use an LED,
    Use a low current white or yellow LED with a series resistor.

    Note Alec_t words above.
    And the fact that you will have a different color than the Yamaha orange.

    Note also that a Yamaha service center near you may know the exact lamp you need and may have it as well.
     
    Rick79 likes this.
  8. Alec_t

    Alec_t

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    Jul 7, 2015
    If you get a replacement filament bulb, I'd suggest wiring a low value resistor in series with it to prolong its life without significantly reducing the brightness.
     
    Rick79 likes this.
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