The first thing I ever built without a kit was a 5 V regulated power supply using the old LM309K. That’s a classic linear regulator like a 7805. While they are simple, they waste a lot of energy as ...

A circuit bot is a great way to introduce children to basic concepts of creating circuits. One of the most important things about circuits is that energy flows in one direction, so connecting the ...

New York University neuroscientist Paul Glimcher has a suggestion that is as simple as it is counterintuitive: Rather than trying to pick the best option, start by eliminating the worst. Why do our ...

Figure 1 gives a simple circuit for the PUSH ON, PUSH OFF function with only a few inexpensive components. In this design, the output is connected to the input of the gadget when you press the push ...