I like how the frequency decays- reminds me of a roulette wheel- I don't understand why, though. I had an Engineer's Notebook by Forrest Mims III once, called 555 Timer Cookbook, but I don't recall the circuits being explained. I think one of them was a voltage controlled oscillator. In your previous video, you showed the trigger and threshold at the same potential with no resistor between them but one was marked 2/3 Vcc and the other 1/3 Vcc and that confused me. I guess I should probably send away for a data sheet or download it from their BBS...!
When the roll switch is opened, the 100uF capacitor is sourcing the RC network by itself, and as the capacitor’s voltage decays the pulse frequency decays with it. The 0.33uF timing capacitor will charge up to 2/3 Vcc, then discharge down to 1/3 Vcc, this cycle will repeat as long as the RC network is biased.
Interesting facts about a die. It would take 7 LEDs. The middle spot is only lit on odd numbers. Upper left and lower right are lit when number > 1. Upper right and lower left is lit when number > 3. Middle side LEDs are only lit on 6 and can be controlled together. Come on, you know you want to...
Yes, a cleverly designed diode matrix like you describe can be used to bias the appropriate LEDs for each roll. I would consider pursuing it as a PCB design and assembly project.
That's just plain cool.
I like how the frequency decays- reminds me of a roulette wheel- I don't understand why, though. I had an Engineer's Notebook by Forrest Mims III once, called 555 Timer Cookbook, but I don't recall the circuits being explained. I think one of them was a voltage controlled oscillator. In your previous video, you showed the trigger and threshold at the same potential with no resistor between them but one was marked 2/3 Vcc and the other 1/3 Vcc and that confused me. I guess I should probably send away for a data sheet or download it from their BBS...!
When the roll switch is opened, the 100uF capacitor is sourcing the RC network by itself, and as the capacitor’s voltage decays the pulse frequency decays with it. The 0.33uF timing capacitor will charge up to 2/3 Vcc, then discharge down to 1/3 Vcc, this cycle will repeat as long as the RC network is biased.
Interesting facts about a die. It would take 7 LEDs. The middle spot is only lit on odd numbers. Upper left and lower right are lit when number > 1. Upper right and lower left is lit when number > 3. Middle side LEDs are only lit on 6 and can be controlled together. Come on, you know you want to...
Yes, a cleverly designed diode matrix like you describe can be used to bias the appropriate LEDs for each roll. I would consider pursuing it as a PCB design and assembly project.