Posted on Dec 24, 2012

This circuit is suitable for fitting into slide projectors without a dimmer facility as witb 24-Vac fed halogen lamps. With a few small alterations, it can also be used for dimming 12-V halogen lamps, but not those in a car, because these are fed from a de source. The circuit shown in Fig. 50-1a is intended for operation from a 24-Vac supply, and can handle a lamp load of up to 150 W. For loads up to 250 W, the TIC236 should be replaced by a TIC246.

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Figure shows detail of the connection of a potentiometer to the intensity control input of the TCA280A. Voltage divider RlO-Pl-Rll is fitted externally and can be fed from tbe stabilized voltage available at pin 11 of IC1. The minimum and maximum intensities of the lamp are determined by RlO and Rll, respectively.

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