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Stereo led vu-meter

Discussion in 'LEDs and Optoelectronics' started by Tarjei, Apr 25, 2015.

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  1. Tarjei

    Tarjei

    14
    0
    Apr 14, 2015
    Hi everybody.
    I'm working on some designs for a stereo led vu-meter and would like some inputs on the circuit.

    I'm a totally noob, so any input will be greatly appreciated.

    Will this design work?
     

    Attached Files:

  2. Arouse1973

    Arouse1973 Adam

    5,177
    1,093
    Dec 18, 2013
    Hi Tarjei
    This is a basic volume unit (VU) circuit that should work. There are however other circuits that are better, but give it a try.
    Adam
     
  3. Tarjei

    Tarjei

    14
    0
    Apr 14, 2015
    Thank you. I will try it.
    Sorry about the misspelling in the title.
     
  4. davenn

    davenn Moderator

    13,991
    2,018
    Sep 5, 2009
    sorted out :)

    for IC solutions, you should look at LM3914 and LM3915
     
  5. Tarjei

    Tarjei

    14
    0
    Apr 14, 2015
    Thank you for the quick reply.

    Would the LM3916N allso work? (Allready having two of these laying around gathering dust.)
    Found this circuit using the 3916, but is this possible to modify to use with relay?
    [​IMG]

    I allso tried modifying the circuit to controll relays so I can make a floor-to-celing vu-meter using regular e27-bulbs.
    any input on this? Do you think this will work?
    (All the components is ordered, and I'm wating for the arrival)
    Screenshots_2015-04-26-09-40-14.png
     
  6. ramussons

    ramussons

    428
    85
    Jun 10, 2014
    Why use Relays? It will be much better to use Opto Coupled Thyristors that can be directly driven by the LM xxxx. No contact sparking, No chatter, Unlimited Life Cycle as compared to a mechanical Relay.
     
    davenn likes this.
  7. Tarjei

    Tarjei

    14
    0
    Apr 14, 2015
    Well thank you for the update :)
    I must say I have never used Opto Coupled Thyristors before. How should i wire these? And allso are there anyone that uses 5v as trigger and can put 220v through?

    Again thank you everyone for the replies :)
     
  8. ramussons

    ramussons

    428
    85
    Jun 10, 2014
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