As with many inventions, two people had the idea for an integrated circuit at almost the same time. Transistors had become commonplace in everything from radios to phones to computers, and now ...

But when the task at hand is growing oxide layers on silicon chips in preparation for making your own integrated circuits ... design and construction of a DIY tube furnace. In case you missed ...

but that [DIY GUY Chris] built the circuit schematic specifically to be easily copied into PCB designs for other projects, which means that lithium batteries can more easily be integrated directly ...