Amazon.com: HiLetgo 5pcs DC 5V Laser Transmitter Module Wave Length 650 nm for Arduino PIC AVR : Industrial & Scientific
Zener Diodes Kit, 1W Power Diode Assorted Assortment Box Kit Set (8.2V/9.1V/10V/11V/12V/13V/15V/16V/18V/22V), Range 1N4738~1N4748,Pack of 200, By Ltvystore: Amazon.com: Industrial & Scientific