Sawtooth wave oscillator

Hiya peoples,
So far I've spent 2 hours goggling for a simple sawtooth wave oscillator with no sucess. My mate said you could make one out of 2 transistors, a resistor and a cap, but trying to find a simple circuit to start with is becoming a pain so if anyone can provide a simple schematic or a link to a site I'll greatly appreciate it.

Cheers Bryan1

Hello,

I hope this can be useful, I scanned it from a book:

The ratio of R1 - R2 will vary the shape of the saw.

Place a diode across R2 for a more shaply saw tooth (ramp).

Add a current source transistor to charge the capacitor linearly: