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Thrifty LED Protector using 2N3904-2N3906

An LED is sure to fail if the current through it is too high. You will soon discover this after you have blown a few up. A simple resistor in series suffices to solve the problem and a better solution is almost inconceivable, because in this case you need only one additional cheap component. As [...]

2 Parking Sensor System and Led Display

4 Piece Rear Parking System (Sensors x 2, ain, Display) 2 x 1-Inch Diameter Wired Rear Sensors (9 Foot) Digital Distance Object Wired Indicator (25 Foot) 4 Color 7 Stage Led Indicator 4 Stage Built-in Beeping Alarm Display Distance: 2.0m ~ 0.3m Reverse Sensor Trigger Sensor Cutout Tool Included… Read more



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