Circuit for plural lamp control in slide projectors or the like

Details Circuit for plural lamp control in slide projectors or the like Circuit for plural lamp control in slide projectors or the like

1976-05-19

1978-03-21

LaRoche, Eugene R.

Electric lamp and discharge devices: systems

Current and/or voltage regulation

Plural load device regulation

315198, 315312, 353 85, H05B 3700, H05B 3902

Patent

active

040805514

ABSTRACT:
Two lamps are controlled in that one is off and the other one on or vice versa with fractural transition from one state to the other being controlled by a differential amplifier with integrated, pulse or trigger switch operated Miller integrator. The differential amplifier control circuit elements (transistors, triacs) in separate circuit paths for the lamps. The control is either a direct one (d.c.) or an indirect one through phase shifting of firing pulses in a.c. operated triacs.

REFERENCES:
patent: 3521124 (1970-07-01), Bogner
patent: 3534224 (1970-10-01), Skirpan et al.
patent: 3684919 (1972-08-01), Cramer
patent: 3835349 (1974-10-01), Yancey

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