The TTL output stage is a rather complicated pushâpull circuit known as a totem-pole output (the transistors, diode, and resistor in the right-most slice of this TTL logic gate circuit). It sinks currents better than it sources current.
The theory for spontaneous generation refers to the idea that life can produced from nonliving things. Lazzaro Spallanzani proposed in his experiement that air was necessary for spontaneous generation.
ââââââââââ. Whenever thinking of Radio, we usually think of one man: Guglielmo Marconi. Radar, on the other hand resulted from the work of many men. In 1793, the Italian scientist Lazarro Spallanzani, a professor at Padua University studied the ability of blind bats to navigate using ultra sound.