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.

Author: Brakasa Kazihn
Country: Oman
Language: English (Spanish)
Genre: Music
Published (Last): 11 December 2010
Pages: 376
PDF File Size: 10.52 Mb
ePub File Size: 8.20 Mb
ISBN: 913-5-48809-515-6
Downloads: 88653
Price: Free* [*Free Regsitration Required]
Uploader: Zolosho

I would appreciate your support in this way! Sign up using Email and Password.

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

Electronics Part We will start with the electronics part. Post as a guest Name. Here is the picture of the problem: 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. Just make sure it has the appropriate current rate. 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.

Email Required, but never shown.

You can watch the following video or read the written tutorial below for more details. This project is based on the LM integrated circuit which can sense analog voltage levels and driver jeter LEDs. If that still doesn’t help, you’ll just have to ‘manually’ reduce uv input voltage between the cap and pin 5 with a simple voltage divider. This is the schematic from SFE and they way i hooked everything up. Post Your Answer Discard By clicking “Post Your Answer”, you acknowledge that you have read our updated terms of serviceprivacy policy and cookie policyand mter your continued use of the website is subject to these policies.


The 1M resistor offers some impedance for the capacitor to work against and helps tie the audio signal v a better reference, and the capacitor will remove the DC offset present in the audio signal. Check what kind of voltage is there with a multimeter if you can first, or just stick with trial and error.

Sign up or log in Sign up using Google.

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’. Currently you have JavaScript disabled.

In order to post comments, please make sure JavaScript and Cookies are enabled, and reload the page. After inserting all LEDs we need to solder all negative leads together and solder a separate wire to each positive lead. 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.

So if there is anyone that might know whats up with this, it would be much appreciated. With a huge spektrum? That would be great Reply. Hello, Can I use 9Vdc power supply without doing any modification? So it that way I connected a total of 40 LEDs. Once we are done with that we also need to solder all wires coming from the LEDs to the circuit board.


All manner of rectifiers can be found in the ‘s datasheet, and the goes that bit further with genuine-specification VU-meter circuits. For that purpose I used a 5mm tick Styrofoam but a cardboard or something like that can be also used.

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. By using our site, you acknowledge that you have read and understand our Cookie PolicyPrivacy Policyand our Terms of Service. So, in the housing first goes the filmed glass and on keter of it the Styrofoam with the LEDs.

CharlieHanson 1, 4 Next we need something on which we will attached the LEDs that will hold them between the mirror and the glass.

By clicking “Post Your Answer”, you acknowledge that you have read ,m3915 updated terms of serviceprivacy policy and cookie policyand that your continued use of the website is subject to these policies.

Yes, you can use 9V DC power supply.

Infinity Mirror Music VU Meter Electronics Project using LM3915 IC

Leave a Reply Cancel Reply Your email address will not be published. Inside a metr PCB factory: You’ve saturated the input SIG, pin 5 above the reference voltage Rhi, pin 6. Therefore from the other side of the filmed glass you will be able to see the infinity effect.

My guess it scenario b. This website uses cookies to improve user experience.