Frequency Source with Digital Control
![](https://freecircuitdiagram.com/wp-content/uploads/2010/11/DIGITALLY-CONTROLLED-FREQUENCY-SOURCE.gif)
This is a frequency source system that is controlled by a digital (microprocessor/microcontroller) system. This circuit produces a square wave signal with adjustable frequencies. Here is the block diagram of digitally controlled frequency source system:
This frequencies are controlled by microcontroller register, counter or thumb-wheel switches. This system can be used in many applications like numerically-controlled machine tools and computer-controlled test equipment.