LM3915 VU METER PDF

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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Infinity Mirror Music VU Meter Electronics Project using LM3915 IC

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. 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.

Sign up using Facebook. So I connected GND of the 3. I would appreciate your support in this way! 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.

Therefore from the other side of the filmed glass you will be able to see the infinity effect. 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

The analog signal goes metee 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. Now because 10 LEDs are just too less for a project like this, I made a little modification to circuit schematics.

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By using our website, you agree to our use of cookies. Even if you’ve connected the 3. For that purpose I used a metallic box from a perfume meetr was the exactly same size as I needed. Just make sure it has the appropriate current rate.

Once you are done with this, you should test whether the electronics work properly. Next we need to assemble everything together. Electronics Part We will start with the electronics part. Email Required, but never shown.

That would be great.

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

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. Home Questions Tags Users Unanswered. By clicking “Post Your Answer”, you acknowledge that you have read our updated terms of serviceprivacy policy and mteer policyand that your continued use of the website is subject to these policies.

Next we need something on which we will attached the LEDs that will hold them between the mrter and the glass. You’ve saturated the input SIG, pin 5 above the reference voltage Rhi, pin 6. Click here for instructions on how gu enable JavaScript in your browser. Check what kind of voltage is there with a multimeter if you can first, or just stick with trial and error. After inserting all LEDs we need to solder all negative leads together and solder a separate wire to each positive lead.

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. Once they are secured in place on top of them goes the mirror which is also secured using a glue gun.

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This project is based on the LM integrated circuit which can sense analog voltage levels and driver ten LEDs. At this point it can get a bit messy because of the many wires so you should be careful when connecting them. That would be great Reply. Here is the picture of the problem: We will start with the electronics part.

My guess it scenario b. Feel free to ask any question in the comments section below. Now we are ready to move on and start building the infinity mirror. 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.

With a huge spektrum? 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 mdter 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. So it that way I connected a total of 40 LEDs. If that still doesn’t help, you’ll just have to ‘manually’ reduce the llm3915 voltage between the cap and pin 5 with a simple voltage divider.

Nothing changes, always the same results.