PWM Led Flasher

So I'm going through all my old notes and putting what I have on Evernote. From there, I can publish it using Postach.io. Pretty neat.

I lost robthefiddler.com In the meantime, I think this kinda suits me a little better anyways. You Tube is really the way to go for the videos. This will store the images for now just fine.

The point here is to build a lunetta or something similar, or close, or whatever. There really is no right or

wrong, just fabulous noise.

So, here is a circuit to start with. I would love to find a way to integrate it into a lunetta like thing. Shouldnt be too hard.

Its is a strange PWM flashy thing. There is two stages. An LFO and the PWM oscillator.

Originally, I used 1 meg pots, but 100k is probably a better choice. So I redid it for that.

The sound that you get is a chirp chirp sound.

The first pot, changes the flashing speed.

The second pot changes the chirp frequency. Its a little weird since the frequency of the chirp has no real visual effect.

The value of C3 will effect the attack...for lack of a better term. I would not go more than .2 or it pretty much blurs into each other.

Here is the original circuit

Good reference on the schmitt trigger oscillator.

http://www.electronics-tutorials.ws/blog/christmas-lights-sequencer-circuit.html

Flashes 3 LEDs

Here is the original Diagram I did a while ago.