Driving an IR LED: constant current source or not – Arduino, ESP8266, ESP32 & Raspberry Pi stuff
Fire Alarm Circuit using Transistor - Envirementalb.com
How to make a contact-less digital tachometer using IR-light reflection technique
Extend IR Led Range - Raspberry Pi Forums
Infrared Proximity Sensor Using Transistors - IR LED
Supla universal IR emitter for 8 codes - supla.org
Obstacle Detection Circuit using BC547 w/ UTSOURCE | Hackaday.io
Proximity Sensor Circuit Diagram | EdrawMax Editable Templates
infrared - Basic IR circuit question - Electrical Engineering Stack Exchange
Weak infrared output.
BC 547 – Mohan's electronics blog
How to Make Ir Sensor Module : 4 Steps - Instructables
IR Remote Control » Raspberry Pi Geek
Fire Alarm Circuit using Transistor - Envirementalb.com
Infrared Proximity Sensor Circuit | Obstacle Detector Circuit
IR Sensor : Circuit Diagram, Types Working with Applications
IR LED based object detector using transistor | BC547 - YouTube
Obstacle Detection Circuit Using BC547 with UTSource - Hackster.io
5 Simple electronic project with 4017, bc547, bd882, relay, IR led - YouTube | Electronics projects, Ir led, Led
Proximity Switch Using One Transistor with UTSOURCE Service - Hackster.io
IR Decoder & Encoder — Part 2 (DIY 38-kHz IRTR Module)
An Arduino shield to control your house – Diogo Gomes
