Replace which transistor? The one inside the peak detector? Or the one driving the lights? I don't understand. For what it's worth, I don't (& wouldn't) tie in the -15v supply voltage as ground, nor enable it with the audio ground input, I'm no expert, but I'm pretty sure that would toast the radio that's supplying the audio input signal. Is it possible to use a TL074 with a + & a ground to supply the power? I thought that because it was dual rail it needed + & - supply voltages. (Yes, I have a 15v +/- dual power supply module for the split rail TL074s). If I were to include bandpass filters into this circuit, would you recommend placing them prior to the peak detector, following the detector but before the transistor amplifier, or following the amp? I have a spare pair of op-amps on the chip, no reason why I shouldn't use them. Since it's stereo (left & right channels each get their own set of lights), it's easy enough to use a multiplex op-amp.ģ. Could I use a TL074 or an LM328 instead of the MC33171? Because that's what I have available for my bandpass filters. If I decreased the values for these components, could I quicken the release response?Ģ. Would I be correct in assuming that C8/R13 in your circuit are responsible for the slow decay rate on your peak detector? I've toyed with the cap values on the LED string, anything higher than 47uF gives me a sluggish decay, less than that and it flickers noticeably. In place of the Arduino, just connect it to the output of the LM3915 chip with the pull up resistors fitted as mentioned above.Click to expand.Audioguru, a few questions:ġ.
#VU METER LEDS HOW TO#
This shows you how to use a 12V strip using NPN transistors or N channel FETs. They are normally either 5V or 12V working with built in current limiting circuits. It all depends on what sort of strip you have. With this you can use a transistor to switch a much heaver load than a single LED.īasically use a P channel FET or a PNP transistor for driving a 5V load, or an N channel FET or NPN transistor for driving a higher voltage load. Then the output is a signal that will be 0V or 5V.
The German web site is telling you what I said in reply #2. You will see that the resistor chain has different values so giving you a different relationship between the input voltage and the LED lit.īut right now I'm kind of lost n the connection adn type of transistors to use. Look at the circuit on page 5 of the LM3916 and compare it with the circuit on page 7 of the LM3915 data sheet. Yes it will bounce up and down with the volume of the signal but they will not be in Volume Units without using the LM3916 chip. The LM3915 will generate a bar display but it is not a VU display the relationship between the input volume and the display strip will be logarithmic not in Volume Units. Matter of fact yesterday I finished my fisrt circuit basd on that IC Here I attach on schematic of what I wnat to do and how to make the formulas or calculations for it.
I know I must use transistors but I would like to know wich ones to use. Or is better to let arduino do the VU meter part and use a separate rgb led controller to controll the colors of the leds.
#VU METER LEDS PLUS#
I do not know if it's possible to do both functions the VU meter plus the control of the color of the led strip section. I own both and I'm open to suggestions on what wiuld it be the best way to do it. I rather do it with a regular rgb 5050 led strip rather than a WS2812B led strip I have tryed to look into many places for information but somehow I can not find a whole tutorial on how to do it. I got some general knowledge but not the specifics to make it. I want to do an RGB led strip arduino VU Meter
#VU METER LEDS PRO#
I'm not a pro but I'm willing to learn and study further. I'm rather new to electronics and I have been studing Arduino since a year ago on and off. This is my first post here, I hope to find a great community as in other places.
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