Electrical isolation, voltage surges, optocoupler as a switch, optical switch

 PS2501 Series Single Channel 80 Vce 5000 Vrms SMT Photocoupler - DIP-4

https://www.futureelectronics.com/p/semiconductors--optoelectronics--isolation-components-optocouplers/ps2501l-1-f3-a-renesas-1397785

Tantalum capacitor type, 10uf tantalum chip, Types of Tantalum Capacitor,

 TAJ Series 10 uF ±10% 16 V Surface Mount Standard Tantalum Chip Capacitor

https://www.futureelectronics.com/p/passives--capacitors--tantalum-capacitors/taja106k016rnj-kyocera-avx-7015456

Analog switch integrated chips, multiplexer circuit, programmable logic devices

 Single 16 Channel 5 to 20 V 50 Ω CMOS Analog Multiplexer - PLCC-28

https://www.futureelectronics.com/p/semiconductors--analog--multiplexer-demultiplexer/dg406dn-t1-e3-vishay-3148293

Step-down switching regulator, Switching regulator circuit, voltage regulator

 MP2456 Series 50 V 0.5 A 1.45 MHz Surface Mount Step-Down Converter - TSOT23-6

https://www.futureelectronics.com/p/semiconductors--analog--regulators-reference--switching-regulators/mp2456gj-z-monolithic-power-systems-4045646

WIFI transceiver, Best rf modulator, Proprietary RF Module, Bluetooth Accessories

 CYBLE-222014-01: 4.5 V 1 Mbps 21.5 mA EZ-BLE™ PRoC™ Bluetooth 4.2 Module

https://www.futureelectronics.com/p/semiconductors--wireless-rf--rf-modules-solutions--bluetooth/cyble-222014-01-infineon-6068750

Zener fast recovery diode, what is a Zener diode, RF detector diode

 SMAZ15-13 Series 1 W 15 V 200 mA Surface Mount Zener Diode - DO-214AC

https://www.futureelectronics.com/p/semiconductors--discretes--diodes--zener/smaz15-13-f-diodes-incorporated-8137323

Zener diode voltage regulator, Zener diode application

 SMAZ15-13 Series 1 W 15 V 200 mA Surface Mount Zener Diode - DO-214AC

https://www.futureelectronics.com/p/semiconductors--discretes--diodes--zener/smaz15-13-f-diodes-incorporated-2124428