How to Identify Diode Markings
How to Identify Diode Markings Diodes are electronic components that permit the flow of electric current in one direction only, shutting current off when it reverses. These handy devices have dozens of important uses in circuits, including as power supplies and radio signal detectors. Because diodes have polarity, their packaging carries distinct markings that help you connect them correctly in a circuit. Signal Diodes The smallest discrete diodes are designed to handle about 100 milliamps of current. These devices are typically packaged in tiny glass cylinders with a connecting lead at each end. A stripe on the cylinder marks the diode’s cathode, making the opposite side the anode. With some diodes, you may need a magnifying glass to see the stripe clearly. Mid-Power Diodes Diodes used as rectifiers in small power supplies are usually rated between 1 and 5 amps of current, maximum. These components usually have a cylindrical body made of dark epoxy or ceramic with a white or...