lm 3915 vu meter


Posted on Feb 5, 2014

* This meter looked like it works well: YouTube - IndikG tor vybuzenG­ s LM3915 but the schematic is quite different. Google Translate If I followed that schematic, do you think everything would still work You should use a peak detector circuit at the input so that momentary peak voltages light the LEDs long enough to appear bright, instead of th


lm 3915 vu meter
Click here to download the full size of the above Circuit.

e dim blur or not seen. I made one myself not too long ago using the LM3915, not my schematic, but i use it and not pictured, i added a 68 © 1/2w resistor between the anode end of the LEDs and the positive power source. I also substituted the shown 2. 7k resistor for a 1. 2k resistor. For demo purposes due to the size limitation of the PCB, i used 3mm LEDs, hooked up for single channel, runs off a +9v battery and i incorporated an off/on switch. The passive peak detector using a diode ruins the low signal levels that have a voltage less than 0. 6V peak so the circuit does not show the low signal levels. The passive peak detector using a diode ruins the low signal levels that have a voltage less than 0. 6V peak so the circuit does not show the low signal levels Unfortunately true. but i wanted to use as little parts/space as possible due to the size of the PCB i used and it works well for me. For the moment, my circuit is hooked up to the "lineout" of the sound card and to get more than enough signal strength, i max the sound in windows. With the 10k pot, i can always adjust the sensitivity to the IC so the LEDs are not peaking half the time causing a quicker battery drain. I use amplified stereo speakers that has volume control so it doesnt matter and i prefer using the preamped output because the vu meter still displays no matter what volume level on the speakers. I may be wrong but im sure this circuit was more designed...




Leave Comment

characters left:

Related Circuits

  • New Circuits

    .

     


    Popular Circuits

    led How can I effectively reduce the voltage needed to activate a transistor
    variable power supply with l200
    Mcu Reset And Oscillator Circuits Applicationnote
    Telephone Ringtone Generator Circuit
    50 Watt Amplifier
    2-wire LCD interface using PIC16CF84
    Temperature Logger and Standalone Voltage Logger
    Ford Thunderbird: air conditioning instrument panel blow resistor
    USB phone charger
    LS7263 Application Circuit Example
    Differential circuit with constant current



    Top