Last time I showed the final frequency response of Spectrum. I guess now I need to show the finished thing!
As a final touch, I decided to laser cut an acrylic back plate for the circuit board to protect the electronics:
And here are a couple of pictures of it running:
These images give you a pretty good idea of what Spectrum looks like when music is playing.
Here is a video with music – unfortunately, my camera does a pretty rubbish job of dealing with the bright LEDs (they are VERY bright).
In fact the LEDs are so bright that if you turn off all other lights in a room, it does a pretty good job of lighting the whole room and creating “disco lights” in accordance to the music.
Anyway, I am very happy with this project – there isn’t much I would do differently. There are definitely disadvantages to having done this with entirely analogue electronics:
- Unable to dynamically adjust thresholds to produce a good show regardless of music volume
- Many more components required
- More expensive
- Difficult to tune the potentiometers well
On the other hand, I learnt a lot about analogue filters and hand soldering small components and there is something satisfying about doing everything in analogue…