This 1.5V lighting circuit for DCC decoders provides voltage-dropping networks for four function outputs. Removes the guesswork of sizing resistors for dropping function outputs to 1.5V for bulbs and more. Also reduces the amount of wiring needed for lighting circuits making for a cleaner installation. Each circuit consists of a resistor and two diodes to provide approximately 1.4V for each bulb. Measures: 45/64" (.7") Diameter x 5/32" (.15) Thick.