Method and apparatus for controlling electric circuit output lev

Details Method and apparatus for controlling electric circuit output lev Method and apparatus for controlling electric circuit output lev

1991-05-24

1994-05-24

Ng, Jin F.

Communications: electrical

Land vehicle alarms or indicators

External alarm or indicator of movement

340474, 340692, 3403847, 381 57, 381102, 381104, B60Q 126

Patent

active

053152883

ABSTRACT:
Two volume levels may be produced in a backup alarm merely by reversing polarity of the DC power connections to the circuit of the present invention. The magnitude of output power produced by any device powered by a DC source may be switched between two levels merely by reversing polarity of the power source connected to the device when used with a circuit of the present invention.

REFERENCES:
patent: 3943507 (1976-03-01), Neal et al.
patent: 4603317 (1986-07-01), Gailbreath et al.
patent: 4785285 (1988-11-01), Teich et al.
patent: 4881058 (1989-11-01), Berry, III
patent: 4929924 (1990-05-01), Buyak et al.
Wireless World (Jan. 1980) vol. 86 No. 1529.

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