In the paragraph just above the third image on this page the second appearance of the word oscillator should be transistor. Boldface below...
http://www.allaboutcircuits.com/vol_3/chpt_7/8.html
The relaxation oscillator in Figure below is an application of the unijunction oscillator. RE charges CE until the peak point. The unijunction emitter terminal has no effect on the capacitor until this point is reached......
http://www.allaboutcircuits.com/vol_3/chpt_7/8.html
The relaxation oscillator in Figure below is an application of the unijunction oscillator. RE charges CE until the peak point. The unijunction emitter terminal has no effect on the capacitor until this point is reached......