Chopped light relay keyer

Details Chopped light relay keyer Chopped light relay keyer

1975-11-19

1977-06-21

Moose, Jr., Harry E.

Electricity: electrical systems and devices

Control circuits for electromagnetic devices

For relays or solenoids

250559, 307117, 352155, 352174, 361156, H01H 4724

Patent

active

040315606

ABSTRACT:
A phototransistor is coupled to a relay coil and the base of a switching transistor. Light impinging on the phototransistor will cause it to conduct, switching on the transistor causing current flow in the relay coil. Fluctuating light intensity on the phototransistor will cause a corresponding fluctuation of current in the relay coil. A predetermined level of current in the coil will maintain the relay closed.

REFERENCES:
patent: 2351229 (1944-06-01), Potts
patent: 3252141 (1966-05-01), Galin
patent: 3551039 (1970-12-01), Hewitt
patent: 3801031 (1974-04-01), Kamp et al.

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