A tribute to analogue design
master, Bob Widlar

The Fairchild μA723 voltage regulator is not at first sight a particularly exciting integrated circuit. Designed by the legendary Bob Widlar and released in 1967, it should have followed the majority of its contemporaries and faded from supplier catalogues and parts lists during the 1970s as it was superseded by more capable devices. Instead it has persisted, and five decades later it can still be found in the product lists of several semiconductor companies.

This project is a tribute to the chip's dessigner and its legacy.

Assembly and usage

The project includes the following components

Jenny List has written a comprehensive guide to Widlar's μA723 in context of this project. Please follow her guide for the interesting things that this chip and board can achieve.

Further information

Widlar is an open source design, as is most of our work. You can find the design files for the hardware and packaging at our GitHub repository. You can edit the design files using our own PCB design open source software, PCBmodE.

This PCBs were manufactured by Eurocircuits.

Widlar was project #21 of the Boldport Club. If you'd like to purchase a kit, become a member and add one to your order through the shop.

Finally, community contributions for this project are on our community site.