The timed two-voltage circuit can start and run a small de motor or solenoid. The input voltage to the LM317 three-terminal regulator ranges from 5 to 40 V, and the output voltage can range from 2 to 36 V.

With input voltage ""N initially applied to the input, and capacitor Cl in a discharged state, the LM393 comparator"s open-collector output circuit is open-circuited.

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