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10pcs for $1.20
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100pcs for $8.95
The 1N4148 is a very popular diode for general purpose use. You can use a diode in your circuit to protect it from a reverse power connection. You can also use it to reduce a supply voltage that is too high - just add them in series until you reach the appropriate voltage drop (~1V drop per diode). You can view the datasheet for this part here.
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