Stop walking across a dark room to turn on the light. Install a 3-way switch and control lights from two locations.

Both use electricity and both give off light, but that's where the similarity ends. The solution is to buy a dimmer switch rated for both CFL and LED bulbs.

Switch-debounce circuits have been around for a long time, but I'm revisiting them because the art of designing them has skipped a generation of engineers. One example of a switch-debounce circuit ...

Most switch-mode power supplies rely on a PWM (pulse-width-modulated) output that is controlled via voltage feedback. A 555-timer IC can inexpensively perform PWM. The circuit in Figure 1 shows how to ...