A Transistor Univibrator with Stabilized Pulse Duration

The use of an elementary characterization of the transistor leads to a very simple model of the basic emitter-coupled univibrator, or monostable multivibrator. Based on this model calculations of waveforms exhibit a reasonable degree of accuracy. Furthermore, the simplicity of the model is conducive to a facile understanding of the operation of the circuit and its disadvantages. A method for circumventing the adverse effects of temperature upon the quasi-stable duration is readily deduced, and may be extended to permit an increase in quasi-stable duration without an increase in jitter. Experimental and calculated waveforms are given and experimental curves are given which indicate the effectiveness of the temperature stabilization.