Here is a simple tester for checking the basic operations of an infrared remote control unit. It is low-cost and easy to construct. The tester is built around infrared receiver module TSOP1738.

The IR signals from various TV, audio VCR remote controls can be captured by this universal remote control tester while the detector is based on Ubicom SX28 microcontroller which can provide up to ...

Lightweight and portable, the Model 235 Remote Network Cable Tester is a battery-powered unit that can test all of the wiring faults of 10Base-2, 10Base-TX, RJ45, EIA/TIA 356A and 568A, and Token Ring ...

It also has a ground light, if a ground wire is present.<br><br>My question is: on known working cables, the tester shows a green light on pair 1&2 on both the main tester and the remote. <br>Why 1&2?