Hello, this is my first circuit project. Bought a few books to learn about components and basic circuits, i also bought an op amp book with circuits needed to further my knowledge.
Basically i wanted to build a giant circuit that would pick up bass through a mic then would light up LED when the bass hit (can put it in a car, computer case, Frame, etc..). I will be postin updates and would appreciate it if any one who spotted obvious mistakes or opinions on what would or would not work.
The project in theory would have a few stages:
1.Mic Preamp (powers and pics up sound waves for mic)
2. Low Pass Frequency filter (filter out frequency > ~100hz)
3. Audio Power Amplifier (bring up amp and volt input to usable output??)
4.Peak Detector (detects each bass hit)
5. Comparator circuit that would initialize the lights to turn on if input is > than ground.
6. Finally, IC to control LED lights.
Ive started and believe i have accomplished step 1, this is my current circuit:
Using:
1x NTE975 IC General Purpose Op Amp (http://www.nteinc.com/specs/900to999/pdf/nte975.pdf)
5x 56K resistors
3x 10μF Electrolytic capacitors
1x 8Ω Dynamic Mic from radioshack (http://www.radioshack.com/product/index.jsp?productId=2062216)
1x 9v Battery
The Schematic looks like this except R1 is 28K and R2 is 56K:
I built the circuit but theres no way i know is its doing its job, the output at pin 6 is 4v droping down to .1v then poping back up to 4v again the amp is at .2mA from the battery and at the output from the IC its at .01mA -.02mA, that seem right to any one? any one know how i could test this or the next step, low pass filter would involve with these measured ratings?
Help and advice is greatly appreciated!!
Thank You.
Basically i wanted to build a giant circuit that would pick up bass through a mic then would light up LED when the bass hit (can put it in a car, computer case, Frame, etc..). I will be postin updates and would appreciate it if any one who spotted obvious mistakes or opinions on what would or would not work.
The project in theory would have a few stages:
1.Mic Preamp (powers and pics up sound waves for mic)
2. Low Pass Frequency filter (filter out frequency > ~100hz)
3. Audio Power Amplifier (bring up amp and volt input to usable output??)
4.Peak Detector (detects each bass hit)
5. Comparator circuit that would initialize the lights to turn on if input is > than ground.
6. Finally, IC to control LED lights.
Ive started and believe i have accomplished step 1, this is my current circuit:
Using:
1x NTE975 IC General Purpose Op Amp (http://www.nteinc.com/specs/900to999/pdf/nte975.pdf)
5x 56K resistors
3x 10μF Electrolytic capacitors
1x 8Ω Dynamic Mic from radioshack (http://www.radioshack.com/product/index.jsp?productId=2062216)
1x 9v Battery
The Schematic looks like this except R1 is 28K and R2 is 56K:
I built the circuit but theres no way i know is its doing its job, the output at pin 6 is 4v droping down to .1v then poping back up to 4v again the amp is at .2mA from the battery and at the output from the IC its at .01mA -.02mA, that seem right to any one? any one know how i could test this or the next step, low pass filter would involve with these measured ratings?
Help and advice is greatly appreciated!!
Thank You.