LM3915 VU METER PDF

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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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Ideally you should be running the audio signal through at least a rectifier, if not a proper peak detector. CharlieHanson 1, 4 Sign up or lm39115 in Sign up using Google. Now we are ready to move on and start building the infinity mirror.

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That would be great. So I secured the infinity mirror to the box using a glue gun, cut uv cover to size, made the holes and attached the power jack, the audio jack, the potentiometer and the switch. Electronics Part We will start with the electronics part. Once you are done with this, you should test whether the electronics work properly. Click here for instructions on how to enable JavaScript in your browser. 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. Next we need to assemble everything together. Lmm3915 order to post comments, please make sure JavaScript and Cookies are enabled, and reload the page.

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So I connected GND of the 3. 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.

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. You can watch the following video or read the written tutorial below for more details.

Inside a huge PCB factory: We will start with the electronics part. Post as a guest Name. Sign up using Facebook.

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

My guess it scenario b. Now because 10 LEDs are just too less for a project like this, I made a little modification to circuit schematics. Once they are secured in place on top of them goes the mirror which is also secured using a glue gun.

So it that way I connected a total of 40 LEDs. So if there is anyone that might know whats up with this, it would be much appreciated. By using our website, you agree to our use of cookies. Hello, Can I use 9Vdc power supply without doing any modification?

Currently you have JavaScript disabled. Leave a Reply Cancel Reply Your email address will mefer be published. Sign up using Email and Password. For that purpose I used a metallic box from a perfume which was the exactly same size as I needed. Check what kind of voltage is there with a multimeter if you can first, or just stick with trial and error.

Depending on the quality of the film and the amount of reflection it provides, the light will vi bouncing between the mirror and the glass but at the same time some of the light will escape through the glass.

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That would be great Reply.

Infinity Mirror Music VU Meter Electronics Project using LM3915 IC

Next we need to solder all electronics components as described in the circuit diagram previously. After inserting all LEDs we need to solder all negative leads together and solder a separate wire to each positive lead.

Here is the picture of the problem: 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. Even if you’ve connected the 3. Email Required, but never shown. Feel free to ask any question in the comments section below.

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’. At this point it can get a bit messy because of the many wires so you should be careful when connecting them.

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. For that purpose I used a 5mm tick Styrofoam but a cardboard or something like that can be also used.