Circuit for plural lamp control in slide projectors or the like

Electric lamp and discharge devices: systems – Current and/or voltage regulation – Plural load device regulation

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Details

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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