2N2222		https://learn.adafruit.com/adafruit-arduino-lesson-13-dc-motors/transistors	NPN transistor

MOSFET

https://en.wikipedia.org/wiki/2N2222

2N3904 200mA vs 2N2222 1A   (NPN -- current -- emitter to collector)
above that go to "Darlington

2N2907	PNP


TO-92	https://en.wikipedia.org/wiki/TO-92
TO-126	https://en.wikipedia.org/wiki/TO-126

TIP120		https://www.arduino.cc/en/Tutorial/TransistorMotorControl


https://en.wikipedia.org/wiki/Bipolar_junction_transistor#NPN



Diode	https://en.wikipedia.org/wiki/Flyback_diode

http://www.me.umn.edu/courses/me2011/arduino/technotes/dcmotors/motorcontrol/motorcontrol.html


IRL510

H-bridge
http://www.me.umn.edu/courses/me2011/arduino/technotes/dcmotors/L293/L293.html


Arduino Motor Shield -- v3
https://store.arduino.cc/usa/arduino-motor-shield-rev3
	L298P    [H-bridge]
		http://www.st.com/content/ccc/resource/technical/document/datasheet/82/cc/3f/39/0a/29/4d/f0/CD00000240.pdf/files/CD00000240.pdf/jcr:content/translations/en.CD00000240.pdf
	LMV358MMX	[op-amp]
	https://www.arduino.cc/en/uploads/Main/arduino_MotorShield_Rev3-schematic.pdf
	4077D	XNOR or NAND


IRF540
2N2222
TIP120
2N3904 < 2N222
PN2222 (NPN) --- PN2907 (PNP)
TIP120 -- Power Darlington  (N-channel)
IRLB8721 --- MOSFET

TO220


relay