Want to play with dimming LEDs? Want to drive something with a little more power than a microcontroller alone can provide? TK takes us through a simple dimming circuit design including some things not ...

Unfortunately, some PBX systems signal ringing to extension phones by raising the dc line voltage. A traditional ac-coupled detector is thus useless. The circuit in Figure 1b consists of a full-wave ...

For a simple DC circuit, this isn’t too difficult since it just requires measuring the resistance, capacitance, and inductance of the overall circuit and can be done with something as simple as ...