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10pcs for $1.60
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100pcs for $11.48
The 1N4004 is a very popular diode for general purpose use. One commen application is to solder the diode across motor leads so that when the motor is powered off the voltage generated (as the motor continues to spin it acts like a generator) can be safely diffused through the diode. You can also use a diode in your circuit to protect it from a reverse power connection. You can view the datasheet for this part here.