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TL431 - Voltage Reference
Price: $1.24
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Sparkfun Item #: COM-11078 -

The TL431 is a three‚ąíterminal programmable shunt regulator diode. This monolithic IC voltage reference operates as a low temperature coefficient zener which is programmable from Vref to 36V with two external resistors. They exhibit a wide operating current range of 1.0mA to 100mA with a typical dynamic impedance of 0.22 ohms. The characteristics of these references make them excellent replacements for zener diodes in many applications such as digital voltmeters, power supplies, and op-amp...

Transistor -  NPN, 60V 4A (2N5192G)
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Price: $2.26
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Sparkfun Item #: COM-13951 -

This is the 2N5192G, an NPN silicon transistor. This little transistor can help in your project by being used to help drive large loads or amplifying or switching applications. The 2N5192G is specifically rated at 60V and 4A max. Documents: Datasheet

Transistor - NPN, 50V 800mA (BC337)
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Price: $0.89
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Sparkfun Item #: COM-13689 -

This is the BC337, an NPN silicon BJT (Bipolar Junction Transistor). This little transistor can help in your project by being used to help drive large loads or amplifying or switching applications. The BC337 is specifically rated at 50V and 800mA max. Note: The BC337 is a drop-in replacement for the P2N2222A Transistor Documents: Datasheet

Transistor - NPN, 60V 200mA (2N3904)
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Price: $0.89
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Sparkfun Item #: COM-00521 -

These are very common, high quality BJT NPN transistors made by ST Micro. Datasheet: 2N3904

Transistor - PNP (2N3906)
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Price: $0.89
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Sparkfun Item #: COM-00522 -

These are very common, high quality BJT, PNP transistors made by ST Micro. **Datasheet: **2N3906