| Author | Views | Views Today | Rank | Comments |
| 24,504 | 67 |   |
10 |
| Author | Views | Views Today | Rank | Comments |
| 24,504 | 67 | |
10 |
|
This 3 channel 15 LED spectrum analyzer is the perfect addition to any audio amp project. It produces fantastic displays on three LED bars that can be individually adjusted for any particular frequency range. The circuit will take line level output from most any audio source, and operates on 12V DC. This means that it can even be run in a car. |
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| I will believe it works when I will try | ||
| where can I get a board to make a 10 LED analizer? | ||
| very usufull | ||
| Good. The errors are fixed. Nobody said they were fixed. It is too bad it still uses the obsolete LM3900 quad Norton amp. The Japanese LED drivers are hard to find. | ||
| You said " ...It produces fantastic displays on three LED bars that can be individually adjusted for any particular frequency range " I would be interested to make it for 16, 31.5, 63, 125, 250, 500, 1000, 2000, 4000, 8000 and 16000 Hz (ref. http://zone.ni.com/devzone/cda/tut/p/id/101 ) by adding 8 more lines but the problem here is to calculate those new values. My question is could you make one of these and post it here? I am deeply interested. Thank you. | ||
| i like your analysis but theres a something wrong to your design... | ||
| Your Schematic for this circuit is not correct. You do not have Pin 5 of the Bar Graph IC's grounded in any way, as it should be. Instead you have the output of the center amp stage connected to all of the Pin 5's that SHOULD BE GROUNDED. You have pin 8 ( The Input ) of the center Bar Graph IC grounded, and it should clearly be connected to the output of the center stage amp. You also have Vcc connected to the Bar graph IC thru a resistor, and no current limiting resistor for the LED's, as the LED's are connected directly to Vcc. Vcc should go directly to pin 9, and the resistor's (26,28 & 30) should be used as a current limit for the LED's from Vcc to the LED banks. With the circuit as it is shown, the bar graph part will not work. Without having hooked the amp part up, I do not know if there are mistakes there also or not. Hope this helps those that may be trying to make this circuit work.. (Editor's notes: I'll fix the diagram next time I update the site.) |
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| is there any pcb? Oscar, Chile | ||
| l like the analysis | ||
| thank u very much for all this good crt and all the website memeber thank u | ||
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