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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Yes, you km3915 use 9V DC power supply. Inside a huge PCB factory: Click here for instructions on how to enable JavaScript in your browser.

Once you are done with this, you should test whether the electronics work properly. Nothing changes, always the same results. CharlieHanson 1, 4 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.

Sign up using Facebook. Check what kind of voltage is there with a multimeter if you can first, or just stick mfter trial and error. At this point it can get a bit messy because of the many wires so you should be careful when connecting them. Electronics Part We will start with the electronics part.


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

Sign up or log in Sign up using Google. For that purpose I used a metallic box from a perfume which was the exactly same size as I needed. So it that way I connected a total of metrr LEDs.

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 fu to circuit schematics. Next we need something on which we will attached the LEDs that will hold them between the mirror and the glass. Just make sure it has the appropriate current rate.

Email Required, but never shown. 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. Currently you have JavaScript disabled. Next we need to solder all electronics components as described in the metet diagram previously.

I would appreciate your support in this way! That would be great.

Infinity Mirror Music VU Meter Electronics Project using LM3915 IC

That would be great Reply. So, in lmm3915 housing first goes the filmed glass and om3915 top of it the Styrofoam with the LEDs. Ideally you should be running the audio signal through at least a rectifier, if not ln3915 proper peak detector. All manner of rectifiers can be found in the ‘s datasheet, and the goes that bit further with genuine-specification VU-meter circuits. Post as a guest Name. Sign up using Email and Password. 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: After inserting all LEDs we need to solder all negative leads together and solder a separate wire to each positive lead. Feel free to ask any question in the comments section below. By using our site, you acknowledge that you have read and understand our Cookie PolicyPrivacy Policyand our Terms metwr Service. This project is based on the LM integrated circuit which can sense analog voltage levels and driver ten LEDs.