nyten Posted February 6, 2016 Posted February 6, 2016 That depends on the field ... what it is about? Quote
sagnik Posted February 7, 2016 Author Posted February 7, 2016 I want to create a circuit board with 50 LEDs, 25 is for left channel and 25 is for right channel. The LEDs will blink on music. Without any complex electronics. I've already made it, but the power is too low. I've used 9 LEDs, 9V Battery, TIP-31 Transistor, 3.5mm Audio Connector (male) & Vero Board. How can I do this? Quote
nyten Posted February 7, 2016 Posted February 7, 2016 ok a 2-channel light organ.I have found a circuit diagram of a 3-channel light organ with one LED per channel which can be modified well.Do you have the datasheet of the LEDs?A 9V battery may only last a few hours (depends on the power of the LEDs) Quote
sagnik Posted February 7, 2016 Author Posted February 7, 2016 I think I don't have a datasheet. What do you mean by datasheet of LED? Quote
nyten Posted February 7, 2016 Posted February 7, 2016 Electrical characteristics like forward voltage and max current. Quote
sagnik Posted February 7, 2016 Author Posted February 7, 2016 Forward Voltage: 3VMax Current: 20-25mA Quote
nyten Posted February 7, 2016 Posted February 7, 2016 Is the brightness sufficient when a LED is operated at 2.9V or even 2.8 V?if so:Are the LED's bright enough when you connect 3 in row with the transistor to 9v? Otherwise the audio signal needs to be amplified. Quote
nyten Posted February 9, 2016 Posted February 9, 2016 (edited) No, the LEDs are not bright. While operating them at 2.9V, 2.8 V or 3 leds in row with the transistor? In my view, the input signal must be amplified anyway because the base current will be too low. I's suggest to solve it with an operational amplifier. If one led isn't bright enough at 2.8V, I would replace the transistor by a Mosfet. But there are certainly also other ways than my suggestion. *datasheet: Collector-Emitter Saturation Voltage = 1.2 sry, i didn't read that earlier. (7.8V remaining->) 2 in row with a resistor Edited February 9, 2016 by nyten Quote
nyten Posted February 10, 2016 Posted February 10, 2016 http://www.dieelektronikerseite.de/Pics/Circuits/3%20Kanal%20LED-Lichtorgel%20S01.GIF (http://www.dieelektronikerseite.de/Circuits/3%20Kanal%20LED-Lichtorgel.htm)(3 frequency spectra) There are many more variants, simply search for "led organ". :)/&--#62;/&--#62; Quote
sagnik Posted February 10, 2016 Author Posted February 10, 2016 Here is my circuit diagram. It has 4 LEDs but, I've used 3 rows of LEDs, each rows have 3 LEDs. In total I've 9 LEDs. Everything is working fine but, the problem is that, the LEDs are not bright enough. And I've a 9v Battery, a TIP-31 Transistor. Quote
nyten Posted February 10, 2016 Posted February 10, 2016 I think the music-voltage is too low to provide sufficient base current. http://img.xyro.tk/16041190926.jpg*you can check it by using a 1,5V battery instead of your music signal. But don't forget the base resistor!! I'd urgently recommend to use a base resistance, this can prevent a high, uncontrolled base-current. Quote
sagnik Posted February 11, 2016 Author Posted February 11, 2016 Ok, if I connect it to a pc, then will it work? Quote
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