Experimental investigation of synchronized UJT trigger circuitusing UJT 2N2646

As the name implies unijunction transistor (UJT) is a one junction, two layered three lead electronic semiconductor device and acts exclusively as an electrically controlled switch. UJT is a very popular current controllable negative resistance semiconductor device and exhibits switching characteristics. UJT is commonly used for generating triggering signals for silicon controlled rectifiers, thyristors as well as triacs for AC power control applications. UJTs are also used in gate pulse, timing circuits and pulse generating circuits referred to as relaxation oscillator. The state of the art presented in the paper is the experimental investigation of synchronized UJT trigger circuit using UJT 2N2646. Experimental circuit was designed and the entire system produced excellent results in the form of voltage waveforms at different points which were observed on the cathode ray oscilloscope (CRO).