Hey those are great project!
I went out this morning and bought the LM3915
It really is a great chip as im sure you all know!
I think my first analog class is in my second year .. I am in the 1B term right now..
I cant wait to get through these basic science and math classes so i can dive right into all that the ECE department has!!
Right now I basically have the sound from my computer entering a non inverting lm 358 op amp.. with 2x gain.. the signal goes into the 3915 (logarithmic) chip and outputs the VU on red LEDs..
The lower numbered lights were dimming once the upper lights were active.. so added a 100uf decoupling cap.. fixed it..
Here a few questions:
I cant figure out how to take the small signal output by the computer without degrading the quality of the speakers..
I have the signal split..
I think Im going to make 2 (10 LED) meters .. once for the left channel and one for the right.. probably tape them to my monitor
Id like to use red LEDS for the lower sound levels, then yellow and at the top green..
Im just wondering if different colored LEDS require different current inorder to look the same brightness
I hope im not asking to many questions/ starting to many new threads.. its just that I am on my COOP term for my program and able to finally attack all the projects I couldnt do while in residence!
thanks