Kenneth was curious about Phase Locked Loops so he decided to dive into them. PLLs generate an output signal that is phase-synchronized to an input signal. They are widely used in telecommunication, radio, and computer systems. One place we commonly find PLLs is the frequency multiplier circuit inside microcontrollers. [via]
The inevitable next step was to break out the breadboard, put together a simple PLL, and just play with it some to try and really get the concept. Luckily, the classic 4000 logic series includes the 4046 PLL chip, which includes both a voltage controlled oscillator and both types of phase detectors. After putting it all together, I figured I’d record a video and let you enjoy the play-by-play as I try and break it all down for you.
A basic introduction to Phase Locked Loops - [Link]