CD4046 is a PLL or phase lock loop, it mainly consists of a VCO and phase comparators. This is a component in FM demodulation and modulation.

Mixed and Interface Circuits

It is used in a closed loop control to maintain a stable frequency. The Circuit above is good for learning the full use of a small Dual Trace Scope. The Circuit has both Analog and Digital areas and is a part of communication.

PLL circuits are now frequently being used to demodulate FM signals, making obsolete the Foster-Seerly and radio detectors of the early years. Other applications for PLL circuits include AM demodulators, FSK decoders, two-tone decoders and motor speed controls.

• Phase-Locked Loop Tutorial, PLL
• Tutorial on Digital Phase-Locked Loops pdf
• Phase Locked Loop Basics pdf
• Optical obstacle switch - del50006

Read the pages above for building more Knowledge on PLL