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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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Now we are ready to move on and start building the infinity mirror. 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. All manner of rectifiers can be found in the ‘s datasheet, and the goes that bit further with genuine-specification VU-meter circuits.

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. Sign up using Facebook.

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

Once you are done lm39115 this, you should test whether the electronics work properly. You can watch the following video or read the written tutorial below for more details. You’ve saturated the input SIG, pin 5 above the reference voltage Rhi, pin 6.

Feel free to ask any question in the comments section below. Therefore from the other side of the filmed glass you will be able to see the infinity effect.

It may be a little too much, but you get a much better visual effect. So it that way I connected a total of 40 LEDs.

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

Hello, Can I use 9Vdc power supply without doing any modification? Click here for instructions on how to enable JavaScript in your browser. 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. For that purpose I used a metallic box from a perfume which was the exactly same size as I needed.


Inside a huge PCB factory: 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’ fu the same as the ‘ground’.

Home Questions Tags Users Unanswered. Leave a Reply Cancel Reply Your email address will not be published. My guess it scenario lm39915. If you look at the SF schematic, they’ve connected a direct adjustable DC source to pin 5, whereas you’re connecting an audio source that could be: Sign up or log in Sign up using Google.

Infinity Mirror Music VU Meter Electronics Project using LM3915 IC

This website uses cookies to improve user experience. 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. That would be great. 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: Post Your Answer Discard By clicking “Post Your Answer”, lm33915 acknowledge that you have read our updated terms mster serviceprivacy policy and cookie policyand that your continued use of the website is subject to these policies.

Email Required, but never shown. 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.


This project is based on the LM integrated circuit which can sense analog voltage levels and driver ten LEDs. Nothing changes, always the same results. Just make sure it has the appropriate current rate.

I would appreciate your support in this way! Electronics Part We will start with the electronics part. 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. This is the schematic from SFE and they way i hooked everything up. For that purpose I used a 5mm tick Styrofoam but a cardboard or something like that can be also used. That would be great Reply.

vj 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. With a huge spektrum? Yes, you can use 9V DC power supply. Check what kind of voltage is there with a multimeter if you can first, or just stick with trial and error. 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.

So I connected GND of the 3. CharlieHanson 1, 4 Once they are secured in place on top of them goes the mirror which is also secured using a glue gun. By using our website, you agree to our use of cookies. Next we need to assemble everything together.