One of these might be a possible fit I’d look at what the limitations of the downstream components are and suggest a 15v standoff type if it were tolerated. The second method involves the use of an M328 component tester. The first one is by locating the gray bar on the body of the diode that is the cathode terminal. That scenario would not bode well for repair prospects either, as in that case each weak link in the chain would blow successively until one failed to a sufficiently hard short to drag the offending supply into submission. There are two easy methods that we can use for diode anode cathode identification. That would make some sense from an ESD protection standpoint, and also explain release of magic smoke if a supply of higher voltage than specified was connected. 'ii Figure 2.28 The zener diode characteristic anode cathode / cathode (a) (b) circuit symbol cathode identification. Diodes are intended to conduct current from the anode to the cathode. The terminals of a diode are called the anode and the cathode a schematic symbol for a diode is shown in Fig. If the cathode mark is indeed connected to ground/supply negative, the deceased item would likely be a bidirectional TVS diode, rather than a normal rectifier type. Diodes and LEDs Diodes Diodes are two-terminal semiconductor devices that conduct current in only one direction. Diodes that are meant to do their job by conducting current (most diodes, LEDs, schotky) will do so with a positive anode/negative cathode. If you make the anode positive and the cathode positive it will behave a certain way, if you reverse the polarity it will behave another way. I suspect that you’re savvy enough to understand why this probably isn’t quite right… Anode and cathode are terminals on the the diode. Examining the Markings If the positive side of a voltage source is connected to the positive end of the diode (the anode), and the negative side is connected. I understand what you describe as being represented by the below.
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