- #1
mhache
- 4
- 0
Homework Statement
Hi there,
I'm fairly new to electronics and am hoping to learn how the attached circuit works. It is from a Kip Kay project over at Make Magazine (http://blog.makezine.com/archive/2008/10/weekend-project-ultimate.html)
I have posted the question over at the site but the project is over 3 years old so will not likely be answered.
The circuit drives (via relay) two sets of led "words".
The relay is not specified but I'm assuming it's a 9V SPDT.
What I'm trying to understand is the capacitor/transistor/relay arrangement. Both transistors have a 330uf cap attached with one lead to the base and one to the collector. The collector of each transistor goes to one side of the relay coil. One of the transistors has a resistor between the collector and the relay coil (the one going to the more positive side of the relay judging by the diode)
Homework Equations
I'm hoping someone can explain how this arrangement alternatively provides current to the relay and then not.
Thanks
Marc