Am I not seeing it or is it simply not there?

I find these are good circuits to talk about to assist in the understanding of transistor circuitry and always try to squeeze a little tidbit about them in my classes.

 

Its there, but for reasons known only to themselves it is an astandard design.

Audio oscillator

Wikipedia has much better in the way of articles.

http://en.wikipedia.org/wiki/Multivibrator#Astable_multivibrator

We have had several posts on the subject too.

 

Except for I question the math involved on that page. For example: I don't see how (.6-5)/(.6-2*5) simplifies to 1/2.

 

Except for I question the math involved on that page. For example: I don't see how (.6-5)/(.6-2*5) simplifies to 1/2.

The wikipedia's equation is like this...

Solving for t in:

t = -RC * ln { (VBE_Q1 - VCC)/(VBE_Q1 - 2 * VCC) }

For this circuit to work VCC >> VBE_Q1 .Now the symbol ">>" means "is much greater than" i.e.. the equation is assuming that VBE_Q1 is a very small quantity compared to VCC and subtracting VBE_Q1 from VCC would not make much difference in the value of VCC ,so we are just eliminating VBE_Q1 from the equation and we get

t = -RC * ln { -VCC/-(2 * VCC) }
t = -RC * ln { VCC/2 * VCC}
t = -RC * ln (1/2)

Its like this if x = 0.1 and y = 100,we can say (y - x) is approx y.In figures 99.9 is almost 100.

Good Luck