jrz126
Active Member
I've got another question that applies to my Roof LED's...again heres the backround on it...the leds are controlled by 8 bit shift registers with transistor arrays connected to the 8 outputs to provide the high current. I then control the shift in bit and clock bit using a couple 4017 Counters (used as a frequency divider). The clocks of the counters are controlled by a LM3915 VU meter IC which is connected to my subwoofer amp. So the LEDs change with the music.
The problem is, on the long bass notes, the leds are constantly changing. Now what I'm looking for is a somewhat accurate beat detection.
Here's what I'm thinking about doing:
Still using a low pass filter (subwoofer amp), I'd full-wave rectify the voltage through some diodes, and add a smoothing cap. I'd then take this D.C. signal and pass it through a differentiator op-amp. Then I'd use another circuit that would take the op amp output and convert it to either a 5V or 0V signal for my clock.
Would this work?
Anyone have any suggestions on a better way to accomplish this? (avoiding the microcontroller if all possible).
The problem is, on the long bass notes, the leds are constantly changing. Now what I'm looking for is a somewhat accurate beat detection.
Here's what I'm thinking about doing:
Still using a low pass filter (subwoofer amp), I'd full-wave rectify the voltage through some diodes, and add a smoothing cap. I'd then take this D.C. signal and pass it through a differentiator op-amp. Then I'd use another circuit that would take the op amp output and convert it to either a 5V or 0V signal for my clock.
Would this work?
Anyone have any suggestions on a better way to accomplish this? (avoiding the microcontroller if all possible).