switches - Opto-coupler output photo-transistor as normal BJT - Electrical Engineering Stack Exchange
Juried Engineering 4N26 Optocoupler, Phototransistor Output, with Base Connection Breadboard-Friendly IC DIP-6 (Pack of 10): Amazon.com: Industrial & Scientific
Optocoupler Circuits | Nuts & Volts Magazine
4N26 Optocoupler, Phototransistor Output, with Base Connection Breadbo — Juried Engineering
Juried Engineering Lite-On 4N25 Optocoupler, Phototransistor Output, with Base Connection Breadboard-Friendly IC DIP-6 (Pack of 20): Amazon.com: Industrial & Scientific
Buy 4N35 Optocoupler with base connection DIP 6 pins IC pack of 10pcs