Fail-safe low-pass filtering circuit

Details Fail-safe low-pass filtering circuit Fail-safe low-pass filtering circuit

H - Electricity

03

H

328/164, 333/50

H03H 11/04 (2006.01) B61L 3/00 (2006.01) B61L 23/00 (2006.01) H03H 11/12 (2006.01)

Patent

CA 1158726

(Case No. 8005) ABSTRACT OF THE DISCLOSURE A fail-safe active low-pass filter circuit including a plurality of transistor gates having their inputs coupled to a source of a.c. signals, one of a plurality of field-effect transistor switches coupled to an associated one of the plurality of transistor gates, and a variable R-C network having a variable upper a.c. signal passing level which is determined by which one of the associated transistor gates and field-effect switches is rendered conductive by application of d.c. supply voltage.

387996

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