USB ports have quietly turned into the default power outlet for phones, laptops, headphones, and even monitors, but the ...

A simple, low cost, and precision frequency meter uses only two pins of a pc parallel port (Figure 1). The TTL-level periodic input signal with frequency f IN connects to the ACK pin of LPT1. This ...

C, and USB Type-B ports are used in all sorts of devices nowadays, but they're not all made the same, and some are becoming ...