Editing Reverse Protection Diodes

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These pieces of silicon allow current to flow in one direction only. Quite simply, VCC is allow through but GND is not. Why don't we put a diode on every VCC? Well a diode can cause a 0.7V drop (that's what they teach you in silly eng school at  least) on the power line. So if you are dealing with a really low-power system, 0.7V drop can be too much.  

Here you can see the diode D3 in place.

These type diodes can also be used, four at a time, in an [http://en.wikipedia.org/wiki/Diode_bridge bridge rectifier] configuration. I don't have a good image (now you do), but an bridge rectifier takes an AC signal and rectifies it to a DC signal (neat trick actually). An bridge rectifier circuit will also work with a DC supply.

Diodes come in all shapes and sizes. For this posting, we only care about cheap, bulky, large current diodes. These diodes can handle 1-2A each and are cheap. For some our mass designs, we prefer the surface mount diodes (MBRA140). The MBRA140 comes in an SMA package (hopelessly confused with the SMA antenna connector - who came up with this?!). Many other diodes come in axial packages perfect for bread boarding. They all work the same - there is an anode and a cathode. I was always told to remember the <b>a</b>node was the <b>a</b>rrow and current flows in the direction of the arrow. Cool huh?