why not include the square waveform option.
The square wave form is always selected in IrScrutinizer.
How would using a smartphone to transmit IR commands emulated using the headphone jack equipped with IR diodes constitute a possible danger to infrared receiving hi-fi equipment such as preamplifiers?
Not the equipment, the smartphone. The audio "power" amplifier is designed for 30 ohms resistive/inductive load (or something like that). In particular if using IR diodes without serial resistors (as is described in numerous descriptions/videos!!): this presents the amplifier with essentially a short-circuit. Not to mentioned that your fancy smartphone is locked-up while IR-ing; it cannot be used for phoning or music listening until you unplug the dongle.
it is unfortunate that integrated infrared transmission hardware has been neglected or depreciated by smartphone manufacturers,
Agree to that. It would be better if smartphones and tablets came with an IR blaster.
