That closed circuit is detected by a mini-computer inside the keyboard called a keyboard encoder, which recognizes which key has been pressed. The keyboard encoder takes that information ...

Hagstrom Electronics, Inc. introduces it’s new KE-USB108, full speed USB keyboard encoder. The KE-USB108 features 108 individual programmable inputs. It accepts input from push button switches, toggle ...

2). 2. This scope printout shows the behavior of the circuit when the encoder shaft is moved a little between clockwise and counter-clockwise. Channel 1 is In Channel A (U1 pin 4). Channel 2 is In ...