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UJT_relaxation_oscillator

2016-08-18 11:07  
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UJT_relaxation_oscillator
This figure shows the circuit, waveforms, and characteristics, where a UJT is used as a relaxation oscillator. This basic building block is used in most of the UJT timer and control circuits (described in chapter 9). The waveforms and characteristics are shown in Figs. 5-41B and 5-41C, respectively. The waveforms are those obtained when the circuit values are: RE=10 kΩ, CE= 0.01μF, R2=200Ω, R1=47Ω, and V1=20 V. The approximate period of the oscillator pulses can be found by:RECE×1.7. The value of RE must be such that the load line (Fig. 5-41C) intersects the emitter characteristic in the negative-resistance region. Motorola Thyristor Device Data, 1991, p .1-6-37, 38.