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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Therefore from the other side of the filmed glass you will be able to see the infinity effect.

With a huge spektrum? Emter manner of rectifiers can be found in the ‘s datasheet, and the goes that bit further with genuine-specification VU-meter circuits.

Infinity Mirror Music VU Meter Electronics Project using LM3915 IC

This is the schematic from SFE and they way i hooked everything up. Sign up using Facebook. For that purpose I used a 5mm tick Styrofoam but a cardboard or something like that can be also used. Click here for instructions on how to enable JavaScript in your browser. This website uses cookies to improve user experience. We will start with the electronics part. Nothing changes, always the same results. Feel free to ask any question in the comments section below. 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.

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

So, in the housing first goes the filmed glass and on top of it the Styrofoam with the LEDs. It may be a little too much, but you get a much better visual effect. Email Required, but never shown.


That would be great Reply. Check what kind of voltage is there with a multimeter if you can first, or just stick with trial and error. Once they are secured in place on top of them goes the mirror which is metsr secured using a glue gun. For that purpose I used a metallic mefer from a perfume which was the exactly same size as I meger.

Now because 10 LEDs are just too less for a project like this, I made a little modification to circuit schematics. 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 gu DC offset present in the audio signal.

Leave a Reply Cancel Reply Your email address will not be published. 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 if there is anyone that might know whats up with this, it would be much appreciated. 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.

You can watch the following video or read the written tutorial below for meetr details. The analog signal goes into pin number 5, the pins from 6 to 8 are used for adjusting the voltage reference or the sensing and the pin number 9 is used for selecting Bar or Dot mode.


Ideally you should be running the audio signal through at least a rectifier, if not a proper peak detector. I would appreciate your support in this way!

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

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. Home Questions Tags Users Unanswered.

Post as a guest Name. Next we need something on which we will attached the LEDs that will hold them between the mirror and the glass.

Next we need to assemble everything together. Next we need to solder all electronics components as described in the circuit diagram previously. Here is the neter of the problem: That would be great. Yes, you can use 9V DC power supply.

Just make sure it has the appropriate current rate. Currently you have JavaScript disabled. 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. At this point it can get a bit messy because of the many wires so you should mrter careful when connecting them.

So I connected GND of the 3.