![]() ![]() I hope the figure below can solve this problem of identification. It is important to note that there are many variations on the schematic symbol, however, they all have a triangle with a line across the point and one or two arrows pointing out. LEDs or Light Emitting Diodes don’t come with any labeling on it to identify Cathode (-ve,GND) or Anode (+ve). The cathode on the symbol is the side with the line across the point of the triangle and the anode is the other side. When referencing a schematic (drawing of the electrical pathways and components using symbols), the symbol for the LED shows which way the current flows and allows you to connect the LED the correct way. This is important to remember since the leads may have been clipped. The lead that is closer to the notch is always the cathode. The second feature is a small flat notch on the side of the LED. This longer lead is the anode (+), and the shorter one is the cathode (-). With his permission I have attached my adaptation of the circuit here for discussion. It is a modification of a circuit by Rob Paisley found on his site 'Circuitous' called '3 Light Signal Animator'. ![]() It is a 556 timer circuit designed to operate 3 aspect block signal leds, green, red, and yellow. The first is that LEDs have one lead that is longer that the other. Hi All I have recently been working on a DipTrace schematic project with RTR12, attached below. To make it easier to identify the leads, all LEDs are manufactured with two physical properties. When connecting an LED it is important to be able to distinguish which lead is the anode (positive) and which is the cathode (negative). Since it is a diode, and diodes only let the current flow in one direction, an LED must be wired correctly for it to work. An LED (Light-Emitting Diode) is an electronics component that emits light when it is powered.
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