0 Triangular wave generator using Transistor

The circuit is a simple triangular wave generator using discrete electronic parts. The transistors oscillate and acts like a flip-flop (one on at a time).

circuit diagram

The outputs of the circuit are shown in the diagram below. The duration of time T can be increased or decreased by changing the value of capacitor C. The approximate relationship is T = 2000*C using the materials listed below.

output waveform

capacitance vs time table

Part List:
R1 - 1 kilo ohm 1/4W
R2 - 22 kilo ohm 1/4W
C - See capacitance vs time table above
Q - 2N2222 or similar NPN transistor
DC - 12V DC supply or battery

2N2222 pinout