circuitous code n more Files

This circuit is similar to one shown approximately on July 28,2009 on 
http://fatmanandcircuitgirl.com streaming video show.

It uses the LTSpice free simulator. To see the transistor currents switching 
on and off just hit the "run" button in LTSpice. You should get a plot of 
three wave forms which are the currents going through the 3 LED branches of 
the circuit.


LTSpice (proprietary but free SPICE3 simulator) can be gotten from 

http://www.linear.com/designtools/software/ltspice.jsp


Files:
Multivibrator-Multistage.asc - Primary LTSpice schematic file

Multivibrator-Multistage.raw - Plot file that LTSpice will pull in. It show
the currents through the LED's

Note: You can tweak the values and still get the circuit to work. If you 
build the circuit in real life you can use part values that are in the same 
ballpark. Especially note that you can speed up and slow down the pulsing
by varying the capacitor and/or the 50k resistor.