How to Setup and Change the System Clock on the SAMD21 Microcontroller Family

In this video we look at how to setup and change the system clock on the SAMD21 family of microcontrollers from Microchip / Atmel. This example code is written in C++ and uses direct register access.

Where to access the two versions of the code

• Free version can be found on GitHub: https://github.com/ForceTronics/SamD21_Clock_Setup

• For pay version includes the following additional features:

• Demonstrates how to use the calibration values stored in NVM to tune the 48MHz clock for higher accuracy

• Allows you to change the system clock to 48MHz, 8MHz, 1MHz, and 32768Hz

• Shows how to output the system clock from pin PA27

• Link to code on ForceTronics.com: http://www.forcetronics.com/example-code-for-purchase/samd21-clock-setup-and-control-c-code-example

How to Design 24VAC to DC Power Supply for HVAC Applications Part 2

In the video we look at how to design a 24VAC power supply for industrial and HVAC applications. The supply will be flexible enough to handle DC voltage inputs. The power supply will employ a DC to DC buck converter, half wave rectifier, input protection against over voltage, and output noise reduction circuit features. In part 2 we look at the PCB design, the finished product, and capture some test data to see how it is working.

How to Design a 24VAC to DC Power Supply for HVAC Applications Part 1

 In the video we look at how to design a 24VAC power supply for industrial and HVAC applications. The supply will be flexible enough to handle DC voltage inputs. The power supply will employ a DC to DC buck converter, half wave rectifier, input protection against over voltage, and output noise reduction circuit features

Link to the ferrite bead article mentioned in the video: https://www.analog.com/en/analog-dialogue/articles/ferrite-beads-demystified.html# Link to TI Webbench Power Designer tool: https://webench.ti.com/power-designer/switching-regulator