1. Review with 555 Circuit
ECSE 1010
Fall 2016

2. We Wish to Build a Dual Pulsing LED Circuit
Check for good videos on YouTube
Look for good images and complete info
Look for lots of views and recent for new ideas

3. Circuit Diagrams
Conventional
Interesting/Clever

4. How Does It Work?

5. Generic Circuit Diagram
Ra = 10k
Rb = 10k
C = 10uF
t1 = 0.693(20k)10u = 139ms
t2 = 0.693(10k)10u = 69ms
t = 208ms
f = 4.8Hz

6. LT SPICE
Vcc
2/3 Vcc
1/3 Vcc
208 ms

7. Questions?