This circuit, copied from an old oscilloscope circuit, generates steady sawtooth wave.In original circuit, there was a 6N3(5670) tube,so I use transistors to place it, and it works well.The voltage dividing circuit on the right isn't necessary.The 47uf capacitor can also be 470 pf,470 uf or 4700 uf,thus changing the frequency.from XMU
