Variable threshold amplifier

Details Variable threshold amplifier Variable threshold amplifier

1982-08-27

1989-06-27

Zazworsky, John

Electrical transmission or interconnection systems

Personnel safety or limit control features

Interlock

307290, H03K 5153, H03K 524

Patent

active

048432601

ABSTRACT:
A combination of an npn transistor, a pnp transistor and associated circuitry is utilized to provide a threshold amplifier which has a variable threshold. The voltage level at the emitter of the npn transistor, when the npn transistor is off, determines the variable threshold. A second pnp transistor is preferably utilized to provide a means by which the threshold voltage can be set to a very low voltage level.

REFERENCES:
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patent: 3041469 (1962-06-01), Ross
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patent: 3473044 (1969-10-01), Moriyasu
patent: 3474258 (1969-10-01), Nagy, Jr.
patent: 3487233 (1969-12-01), Reap
patent: 3564285 (1971-02-01), Gilbert
patent: 3569739 (1971-03-01), Stolman
patent: 3573495 (1971-04-01), Xylander
patent: 3579094 (1971-05-01), Jorgensen
patent: 3599015 (1971-08-01), Ulrick
patent: 3646361 (1972-02-01), Pfiffner
patent: 3697780 (1972-10-01), Michael et al.
patent: 3868517 (1975-02-01), Schoeff

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