We found this circuit in a 1992 magazine, but it can be easily assembled today because the components it uses are common. At each pulse of light that hits the high (an LDR) an LED is triggered in sequence indicating the points. The weapon can be made by adapting a laser pointer or a common LED. The shot must be short to prevent triggering the shooter from “searching” the target. Power can be supplied with 6 V and at the end of the sequence there is a beep.
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