Hello Everyone,
I first want to say that this forum is awesome, I stumbled upon it through a google search and there is such a wealth of information here for people interested in electronics.
Okay, now that that is out of the way, on to my problem...I'm looking to create a circuit that takes as its input, left and right speaker signals, amplifies that signal, then separates it according to a range of frequencies by using a LPF, HPF and BPF. The output signal would then trigger high power LED's (3.9V 700mA)
Here is a circuit that I found on the internetz **broken link removed**
For each op amp, I wanted a gain of 10 so I'm planning to use 100K for each feedback resistor and 10K for each input resistor.
Concerning the active filters, I decided to go with a cutoff frequency of 100Hz on the low end, 12kHz on the high end and between 100Hz and 3000Hz for midrange.
Am i on the right route to do what im planning to do. Can someone explain how the darlington transistor play in all of this. I know its to amplify the current as much as I can to the LED's but I cant really grasp it mathematically and conceptually yet. Do I need to take into account the input voltage range of the speaker signals (change in volume)?
Sorry for the long thread, but I really want to complete this. Thanks!
I first want to say that this forum is awesome, I stumbled upon it through a google search and there is such a wealth of information here for people interested in electronics.
Okay, now that that is out of the way, on to my problem...I'm looking to create a circuit that takes as its input, left and right speaker signals, amplifies that signal, then separates it according to a range of frequencies by using a LPF, HPF and BPF. The output signal would then trigger high power LED's (3.9V 700mA)
Here is a circuit that I found on the internetz **broken link removed**
For each op amp, I wanted a gain of 10 so I'm planning to use 100K for each feedback resistor and 10K for each input resistor.
Concerning the active filters, I decided to go with a cutoff frequency of 100Hz on the low end, 12kHz on the high end and between 100Hz and 3000Hz for midrange.
Am i on the right route to do what im planning to do. Can someone explain how the darlington transistor play in all of this. I know its to amplify the current as much as I can to the LED's but I cant really grasp it mathematically and conceptually yet. Do I need to take into account the input voltage range of the speaker signals (change in volume)?
Sorry for the long thread, but I really want to complete this. Thanks!
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