Michael Gasperi, Philippe E. Hurbain, and Philippe Hurbain, Extreme NXT: Extending the Lego Mindstorms NXT to the Next Level, 2nd, Apress, 2009, p. 211, ISBN 978-1-4302-2453-2.
«You could use a 1N4002, but the 1N4148 is smaller and more appropriate for the current...»