Electric signal transmitter, preferably for alarm system

Details Electric signal transmitter, preferably for alarm system Electric signal transmitter, preferably for alarm system

1974-03-28

1977-01-18

Pitts, Harold I.

Communications: electrical

Systems

Selsyn type

340310A, H04M 1104

Patent

active

040042910

ABSTRACT:
An electric signal transmitter preferably for alarm devices, the transmitter being connected with a manually actuatable switch which is galvanically separated from the signal transmitter and which upon actuation opens or closes respectively the current circuit of a current consuming device connected to the electric mains. The signal transmitter, upon actuation of the switch, generates an output signal, the voltage thereof being less than that of the mains. The transmitter comprises a transformer, the primary winding thereof being connected in series with the switch, the consuming device and the A.C. power source, and the secondary winding thereof being connected to a rectifier which via a semi-conductor generates a direct-current voltage signal, with the voltage thereof being less than that of the power source when the circuit, to which the primary winding is connected, is closed.

REFERENCES:
patent: 2492779 (1949-12-01), Anderson
patent: 3228018 (1966-01-01), Benjaminsen
patent: 3234543 (1966-02-01), Thompson
patent: 3239830 (1966-03-01), Schmitt
patent: 3311779 (1967-03-01), Hartkorn
patent: 3312875 (1967-04-01), Mayier

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