My article about voltage-to-frequency converters had a figure that showed the waveform on the base of a unijunction transistor (Fig. 1). This was a PSpice waveform generated by OrCAD 9. After the UJT base reaches 4 V, the base impedance collapses and the base voltage drops precipitously. The surrounding circuitry draws the base down to −13 V. That’s all
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