Transistors Assortment Kit, Current Amplification PNP Transistor High Dielectric Strength for Noncontacting Switch for Controling Current: Amazon.com: Industrial & Scientific
Amazon.com: 8-Channel NPN/PNP to NPN 5V/24V Level Converter Module Square Amplify Signal Conversion Module Level Converter 10MHZ, Conversion and Amplification Circuit, Good, Strong Driving : Industrial & Scientific