Learn about and how to use the LM Logarithmic Dot/Bar If you’re wanting to make a VU meter, you should use the LM which we. You’ve saturated the input (SIG, pin 5) above the reference voltage (Rhi, pin 6). That’s why the only the topmost LED flickers in dot mode and all.

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Currently you have JavaScript disabled. Feel free to ask any question in the comments section below. So, in the housing first goes the filmed glass and on top of it the Styrofoam with the LEDs.

Electronics Part We will start with the electronics part.

So I connected GND of the 3. In order to post comments, please make sure JavaScript and Cookies are enabled, and reload the page. Sign up using Email and Password. The ten output pins are active low with a current from 1mA to 30mA so the LEDs should be connected with the negative lead to the IC outputs and there is no need of resistors.

Lm3195 that still doesn’t help, you’ll just have to ‘manually’ reduce the input voltage between the cap and pin 5 with a simple voltage divider. Hello, Can I use 9Vdc power supply without doing any modification?


Here is the picture of the problem: If you look at the SF schematic, they’ve connected a direct adjustable DC source to pin 5, whereas you’re connecting an audio source that could be: This is the schematic from SFE and they way i hooked everything up. All manner of rectifiers can be found in the ‘s datasheet, and the goes that bit further with genuine-specification VU-meter circuits. My guess it scenario b.

So the glass and the housing that I used for this project are from a wall clock and I managed to find a suitable same size mirror. Home Questions Tags Users Unanswered.

For that purpose I used a 5mm tick Styrofoam but a cardboard or something like that can be also used. Next we need to solder all electronics components as described in the circuit diagram previously.

Once we are done with that we also need to solder all wires coming from the LEDs to the circuit board. Yes, you can use 9V DC power supply.

Infinity Mirror Music VU Meter Electronics Project using LM3915 IC

Click here for instructions on how to enable JavaScript in your browser. I would appreciate your support in this way! Once they are secured in lm315 on top of them vi the mirror which is also secured using a glue gun. You’ve saturated the input SIG, pin 5 above the reference voltage Rhi, pin 6. That would be great.

Leave a Reply Cancel Reply Your email address will not be published. Next we need to assemble everything together.


led – LM VU Meter Not working properly – Electrical Engineering Stack Exchange

If the audio source is your PC soundcard, and you’re powering the from an Arduino board which is in turn powered by the same PC’s USB power, you can’t guarantee the audio ‘ground’ is the same as the ‘ground’.

So I secured the infinity mirror to the metfr using a glue gun, cut its cover to size, made the holes and attached the power jack, the audio jack, the potentiometer and the switch. The 1M resistor offers some impedance for the capacitor to work against and helps tie the audio signal to a better reference, and the capacitor will remove the DC offset present in the audio signal.

meher The input impedance of the is 20k and 12k for theso you might need to fine-tune the cap value to get a better low-frequency cut off. So it that way I connected a total of 40 LEDs. Ideally you should be running the audio signal through at least a rectifier, if not a proper peak detector. Just make sure it has the appropriate current rate.