Occasionally, the cat's body may use vomiting to clear the intestines of toxins. If the vomit contains excessive amounts of mucus, an inflamed intestine may be the cause. Undigested food in the vomit can be due to food poisoning, anxiety, or simply overeating.
The Schmitt Trigger. The Schmitt trigger is a comparator application which switches the output negative when the input passes upward through a positive reference voltage. It then uses positive feedback of a negative voltage to prevent switching back to the other state until the input passes through a lower threshold voltage, thus stabilizing the switching against rapid triggering by noise as it passes the trigger point.
TTL triggers are triggers that are capable of communicating the hotshoe protocol so that features aside from syncing can be sent from the camera's hotshoe to the remote flash foot. If you look at the flash foot or the camera hotshoe, the pin/contact that's in the center of the square is the sync signal. That's the signal that tells the flash when to fire so that it's in sync with the camera shutters and that the light from the flash will be used for the exposure.