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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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.

Next we need to assemble everything together. It may be a little too much, but you get a much better pm3915 effect. Sign up using Email and Password. 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.

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

Hello, Can I use 9Vdc power supply without doing any modification? 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.

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Next we need something on which we will attached the LEDs that will hold them between ,eter mirror and the glass. So, in the housing first goes the filmed glass and on top of it the Styrofoam with the LEDs. Once you are done with this, you should test whether the electronics work properly.

Yes, you can use 9V DC power supply. Now we are ready to move on and start building the infinity mirror. My guess it scenario b.

Infinity Mirror Music VU Meter Electronics Project using LM3915 IC

Even if you’ve connected the 3. We will start with the electronics part.


With a huge spektrum? For that purpose I used a 5mm tick Styrofoam but a cardboard or something like that can be also used. Email Required, meterr never shown. For that purpose I used a metallic box from a perfume which was the exactly same size as I needed.

V 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 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. That would be great. Once they are secured in place on top of them goes the mirror which is also secured using a glue gun. Electronics Part We will start with the electronics part.

Here is the picture of the problem: By using our site, you acknowledge that you have read and understand our Cookie PolicyPrivacy Policyand our Terms of Service.

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

Now because 10 LEDs are just too less for a project like this, I made a little modification to circuit schematics. At this point it can get a bit messy because of the many wires so you should be careful when connecting them. Ideally you should be running the audio signal through at least a rectifier, if not a proper peak detector.

Next we need to solder all electronics components as described in the circuit diagram previously. 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 short period of time.

Once we are done with that we also need to solder all wires coming from the LEDs to the circuit board. In order to post comments, please make sure JavaScript and Cookies are enabled, and reload the page. 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. 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.


Nothing changes, always the same results. Therefore from the other side of the filmed glass you will be able to see the infinity effect. Just make sure it has the appropriate current rate. So if there is anyone that might know whats up with this, it would be much appreciated. After inserting all LEDs we need to solder all negative leads together and solder a separate wire to each positive lead.

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’. This is the schematic from SFE and they way i hooked everything up. This website uses cookies to improve user experience. 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.

So it that way I connected a total of 40 LEDs. Sign up using Facebook. Check what kind of voltage is there with a multimeter if you can first, or just stick with trial and error. That would be great Reply.

Feel free to ask any question in the comments section below. Home Questions Tags Users Unanswered. So I secured the infinity metrr 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. Leave a Reply Cancel Reply Your email address will not be published.