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

As i said, connecting audio jack changes nothing, but for instance if i grab GND and Signal with mi fingers, all of the LED’s light up for a pm3915 period of time. That would be great. 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.

Once they are secured in place on top of them goes the mirror which is also secured using a glue gun. Here is the picture of the problem: 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. For that purpose I used a 5mm tick Styrofoam but a cardboard or something like that can be also used. Nothing changes, always the same results.

Currently you have JavaScript disabled. Inside a huge PCB factory: At this point it vy get a bit messy because of the many wires so you should be careful when meetr them. That would be mefer Reply.

So if there is anyone that might know whats up with this, it would be much appreciated. Sign up using Email and Password. With a huge spektrum?


It may be a little too much, but you get a much better visual effect. Sign up or log in Sign up using Google. Feel free to ask any question in the comments section below. Post as a guest Name. If 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. Post Your Answer Discard By clicking “Post Your Answer”, you acknowledge that you have read our updated terms of serviceprivacy policy and cookie policyand that your continued use of the website is subject to these policies.

You can watch the following video or read the written tutorial below for more details. Once we are done with that we also need to solder all wires coming from the LEDs to the circuit board. Now we are ready to move on and start building the infinity mirror. Hello, Can I use 9Vdc power supply without doing any modification? By using our site, mefer acknowledge that you have read and understand our Cookie PolicyPrivacy Policyand our Terms of Service.

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.

By clicking “Post Your Answer”, you acknowledge that you have read our updated terms of serviceprivacy policy and cookie policyand that your continued use of the website is subject to these policies. 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’.

Infinity Mirror Music VU Meter Electronics Project using LM3915 IC

So it that way I connected a total of 40 LEDs. Now because 10 LEDs are just too less for a lm391 like this, I made a little modification to circuit schematics. 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: Check what kind of voltage is there with a multimeter if you can first, or just stick with trial and error. Meteer you are done with this, you should test whether the electronics work properly.


Ideally you should be running the audio signal through at least a metdr, if not a proper peak detector. After inserting all LEDs we need to solder all negative leads together and solder a separate wire to each positive lead.

Yes, you can use 9V DC power supply. Next we need something on which we will attached the LEDs that will hold them between the mirror and the glass. CharlieHanson 1, 4 You’ve saturated the input SIG, pin 5 above the reference voltage Rhi, pin 6. Just make sure it has the appropriate current rate. All manner of rectifiers can be found in the ‘s datasheet, and the goes that bit further with genuine-specification VU-meter circuits.

Leave a Reply Cancel Reply Your email address will not be published. So metre 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.

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. This project is based on the LM integrated circuit which can sense analog voltage levels and driver ten LEDs.