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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We will start with the electronics part.

This website uses cookies to improve user experience. 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. Next we need to assemble everything together. Therefore from the other side of the filmed glass you will be able to see the infinity effect.

CharlieHanson 1, 4 All manner of rectifiers can be found in the ‘s datasheet, and the goes that bit further with genuine-specification VU-meter circuits. So, in the housing first goes the filmed glass and on top of it the Styrofoam with the LEDs.

Once they are secured in place on top of them goes the mirror which is also secured using a glue gun. Even if you’ve connected the 3. This project is based on the Vi integrated circuit which can sense analog voltage levels and driver ten LEDs. This is ln3915 schematic from SFE and they way i hooked everything up.

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That would be great Reply. That would be great. Sign up using Facebook. So it that way I connected a total of 40 LEDs. Click here for instructions on how to enable JavaScript in your browser.

So I secured the infinity mirror to the box 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. So if there is lm395 that might know whats up with this, it would be much appreciated. Inside a huge PCB factory: 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. Feel metfr to ask any question in the comments section below.


Depending on the quality of the film and the amount of reflection it provides, the light will keep bouncing between the mirror and the glass but at the same time some of the light will escape through the glass. Next we need something on which we will attached the LEDs that will hold them between the mirror and the glass. My guess it scenario b.

Nothing changes, always the same results.

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

By using our website, you agree to our use of om3915. By using our site, you acknowledge that you have read and understand our Cookie PolicyPrivacy Policyand our Terms of Service. After inserting all LEDs we need to solder all negative leads together and solder a separate wire to each positive lead. With a huge spektrum? Here is the picture of the problem: Post as metee guest Name. Next we need to solder all electronics components as described in the circuit diagram previously.

Infinity Mirror Music VU Meter Electronics Project using LM IC – HowToMechatronics

Home Questions Tags Users Unanswered. You can watch the following video or read the written tutorial below for more details.

The analog signal goes into pin number 5, the pins from 6 to 8 are used for adjusting the voltage reference emter the sensing and the pin number 9 is used for selecting Bar or Dot mode. Hello, Can I use 9Vdc power supply without doing any modification?


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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 ,eter is the same as the ‘ground’. Once we are done with that we also need to solder all wires coming from the LEDs to the circuit board.

You’ve saturated the input SIG, pin 5 above the reference voltage Rhi, pin 6. I metee appreciate your support in this way! Currently you have JavaScript disabled. So I connected GND of the 3. For that purpose I used a metallic box from a perfume which was the exactly same size as I needed.

Infinity Mirror Music VU Meter Electronics Project using LM3915 IC

Once you are done with this, you vh test whether the electronics work properly. 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: It may be a little too much, but you get a much better visual effect. At this point it can get a bit messy because of the many wires so you should be careful when connecting them. Check what kind of voltage is there with a multimeter if you can first, or just stick with trial and error.

Yes, you can use 9V DC power supply.