Three terminal replacement for unijunction transistor

Details Three terminal replacement for unijunction transistor Three terminal replacement for unijunction transistor

1989-05-10

1990-10-09

Zazworsky, John

Electrical transmission or interconnection systems

Personnel safety or limit control features

Interlock

307254, 307359, 307636, H03K 3313, H03K 3351, H03K 1730, H03K 1760

Patent

active

049623214

ABSTRACT:
A three terminal replacement circuit for a Unijunction Transistor. The circuit simulates the characteristics and parameters of any UJT with appropriate selection of components. The circuit includes a first node having a voltage in accordance with a biasing circuit, a current conducting circuit for relating the voltage at the first node to a voltage at a second node and for conducting current from a terminal B2 to a terminal B1 through the second node in accordance with a resistor provided in that path, a first switching circuit which turns on when a voltage at a terminal E exceeds the voltage at the second node and a second switching circuit which turns on when the first switching circuit faces. The second switching circuit allows current to flow from the terminal E to the terminal B1 when turned on and changes the biasing circuit to lower the voltages at the first node, the second node and the terminal E.

REFERENCES:
patent: 3296556 (1967-01-01), Schaefer
patent: 3621300 (1971-11-01), Clark

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