Jean-Bernard Guiot

The control circuit in Figure 1 presents a relatively low input resistance and thus imposes a low value on external pulldown resistor R1 to provide the desired low-level input voltage. In turn, R1 wastes power by drawing a relatively high current through switch S1. For...

During the development of systems that include small motors, a simple, bidirectional motor controller with speed adjustment may be helpful. Figure 1 shows such a controller. The circuit uses everyday components whose tolerances and ratings are unimportant as long as they...

A two-line-to-four-line decoder indicates status even when both signal lines lose power. To display the status of two digital outputs, you can simply connect an LED and its resistor on each output. You must, however, interpret, or “decode,” the displayed binary...