I built a circuit where the LED's respond to music by lighting up when the music plays (I believe its a low pass filter because it intensifies with bass and not treble)
http://www.instructables.com/id/Music-LED-Light-Box/ - there is the circuit I used and for the LED I bought on of these off ebay - http://cgi.ebay.com/ebaymotors/LED-...r_Truck_Parts_Accessories&hash=item1e5a4eebea (blue specifically)
When I hook up the LED's straight to the 2 9V I have in series, it lights up very bright obviously, but when I put it in the circuit, the lights barely light up due to the lack of current it needs I'm guessing?
I know if the signal were louder from the music source, they would light up but I don't have an amplifier after my music source or transistor I'm using. Can I use an op amp to boost the signal after my transistor or something? If so how would I do this? I have a 741 chip and resistors I can use, but I'm not sure what values or if I'm doing an inverted or non-inverted configuration.
Thanks
http://www.instructables.com/id/Music-LED-Light-Box/ - there is the circuit I used and for the LED I bought on of these off ebay - http://cgi.ebay.com/ebaymotors/LED-...r_Truck_Parts_Accessories&hash=item1e5a4eebea (blue specifically)
When I hook up the LED's straight to the 2 9V I have in series, it lights up very bright obviously, but when I put it in the circuit, the lights barely light up due to the lack of current it needs I'm guessing?
I know if the signal were louder from the music source, they would light up but I don't have an amplifier after my music source or transistor I'm using. Can I use an op amp to boost the signal after my transistor or something? If so how would I do this? I have a 741 chip and resistors I can use, but I'm not sure what values or if I'm doing an inverted or non-inverted configuration.
Thanks