From wired controls to visible light, ultrasonics and infrared: a short journey through the technological evolution of the television remote control.
How an IR remote control works, explained from real oscilloscope measurements: carrier, MARK, SPACE, header, bit timing and NEC identification.
GX-TXT-v3 tests with a real photodiode and IR remote reveal the 38 kHz carrier, burst timing, and NEC-family protocol.
GX-TXT-v3 testing shows how pulse count affects HOLD-node charging, LED turn-on threshold, and indication time.
GX-TXT-v3 HOLD-node dynamics: burst charging, exponential discharge, LED on-time and sensitivity characterization with GNU Octave.
GX-TXT-v3 sensitivity and threshold testing, following QIN, HOLD and orange LED behavior across gain and sensitivity settings.
GX-TXT-v3 testing with a virtual photodiode: VIR measurements, preamplifier gain, probe loading and LTspice comparison.
GX-TXT-v3 DC bias measurements, current consumption and NE555 timer verification compared with LTspice simulation.
GX-TXT-v3 is a compact IR remote control tester with adjustable gain and sensitivity, 20-second auto-off, PCB layout, and assembly details.
The new version of the IR Remote Tester PCB has arrived, along with the solder paste stencil…