I'm making musical lights; lights flashing in rythm with music. I started this project last spring, and I'm making it at school. Ihad other courses in between so I haven't been on it for a while, but I'm able toreturn to it now.
It Consists of 4 stages:
First is the microphone, I haven't tested this particular design yet, just took a schematic off the internet.
Second is the Aplifier stage, which I have made out of 2 stages for some reason, I can't remember why, but there must've been a reason.
Third stage is the filtering. The frequencies are filtered into 4 channels:
LOW= 0-800 Hz,
LOWMID= 800-2400 Hz,
HIGHMID = 2400-4000 Hz,
HIGH => 4000 Hz.
However as I built these filters seperately and tested them, they turned out as follows:
LOW= 170-1000 Hz,
LOWMID= 450-2400 Hz,
HIGHMID = 1000-3000 Hz,
HIGH => 5000 Hz
While getting 100% precise results is difficult, these results are unacceptable. I don't have the material I used when designing these, so I can't tell you what formulas I used to calculate the size of every component. This is the part I need help with; getting these filters to match description.
The final stage powers the lamps through a triac with 230V.
If memory serves me right, then the amplification stage works more or less as intended. I haven't built the final stage yet, so that's just hypothetically correct. I'll build the last stage after I get the first 3 to work in unison with LEDs (for testing purposes)
All part numbers SHOULD be correct.
ALSO; if you notice anyhthing else wrong with the schematics, please tell.