Hi all out there. I had recently salvaged an IR bulb from a TV remote (universal). The component I am in search for is an IR switch, that is, completes a circuit only when a signal from an IR LED is received. Could this also otherwise be made with common household stuff? I know that I may get many queries on specifications after this, so I am posting the right here. It is not something signal specific that I am searching for, but I want a receiver able to receive the signals of all, or at least of an universal remote. Besides, take this as a general knowledge question. IR stands for infrared, and that stands for heat. If I were to click a remote, at least repeatedly, why don't I feel any warmth? My father says that the heat transmitted is very small, and that should mean that our body may well be above the temperature the LED emits. Here it is the main point: why don't we trigger off the IR receiver in our television ourselves, by our body heat, or for the same purpose, an electric heater, or so on? And a final question: what do you mean by frequencies in infrared? Any fluctuations in temperature or wavelength? If the wavelength were to change, wouldn't it go towards the spectrum of visible light or move towards radio waves?