[a_7amasha]

hi all
i want some help to build a LED bar audio spectrum analyzer, i have already built one but it was very simple using LM3915, it was only one LED bar. So what am trying to do is something like this:
so do i need a frequency filter or another IC, please help me in this and if you could post any schematics because am still a beginner in the electronics
thanks in advance.

[فيصل72]

http://www.scribd.com/doc/12903797/A...Desgin-Project

this link show a circuit with information on how you calculate the filter components. if you can't understand this information you can try the
easy circuit in the following picture

and please use arabic in your posts to find help from most arabic users in this forum.

R1= 1K8KohmR6= 100Kohm trimmerIC1= LM3915R2= 100Kohm trimmerC1= 100nF 100VIC2= 4017R3= 1KohmD1....10= RED LEDIC3= 4011R4= 100 ohm.....1KohmD11....20= YELLOW LEDR5= 100 ohm.....1KohmD21....30= GREEN LED

[a_7amasha]

شكرا للرد وجاري التجربة!