lm 3915 vu meter


Posted on Feb 5, 2014

* This meter looked like it works well: YouTube - IndikG tor vybuzenG­ s LM3915 but the schematic is quite different. Google Translate If I followed that schematic, do you think everything would still work You should use a peak detector circuit at the input so that momentary peak voltages light the LEDs long enough to appear bright, instead of th


lm 3915 vu meter
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e dim blur or not seen. I made one myself not too long ago using the LM3915, not my schematic, but i use it and not pictured, i added a 68 © 1/2w resistor between the anode end of the LEDs and the positive power source. I also substituted the shown 2. 7k resistor for a 1. 2k resistor. For demo purposes due to the size limitation of the PCB, i used 3mm LEDs, hooked up for single channel, runs off a +9v battery and i incorporated an off/on switch. The passive peak detector using a diode ruins the low signal levels that have a voltage less than 0. 6V peak so the circuit does not show the low signal levels. The passive peak detector using a diode ruins the low signal levels that have a voltage less than 0. 6V peak so the circuit does not show the low signal levels Unfortunately true. but i wanted to use as little parts/space as possible due to the size of the PCB i used and it works well for me. For the moment, my circuit is hooked up to the "lineout" of the sound card and to get more than enough signal strength, i max the sound in windows. With the 10k pot, i can always adjust the sensitivity to the IC so the LEDs are not peaking half the time causing a quicker battery drain. I use amplified stereo speakers that has volume control so it doesnt matter and i prefer using the preamped output because the vu meter still displays no matter what volume level on the speakers. I may be wrong but im sure this circuit was more designed...




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