One-terminal type level control circuit

Details One-terminal type level control circuit One-terminal type level control circuit

1982-06-03

1984-10-09

Beha, Jr., William H.

Electricity: power supply or regulation systems

In shunt with source or load

Using a three or more terminal semiconductive device

307549, 307558, 323299, 361 91, H02H 904

Patent

active

044764260

ABSTRACT:
A constant-current source transistor, which exhibits a constant-current characteristic corresponding to the power source voltage of a sensor and is connected to an input signal terminal of an input circuit, such as a microprocessor. A first transistor is connected so that it may supply a current from the power source of the input circuit to the constant-current source transistor, and a second transistor is connected in parallel to the constant-current source transistor. When the signal level at the input signal terminal exceeds a predetermined value, the second transistor is turned ON to effect level control so the input signal level may not become excessively high and damage the input circuit.

REFERENCES:
patent: 3124697 (1964-03-01), Trenchard

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