Explore 15 outdated technologies that quietly shaped today’s biggest innovations and transformed the modern world.

A quadrature encoder uses two output channels offset in phase to detect both direction and position with greater precision.

Combining Cor Van Rij's JFET test socket with two DMMs, a current limiter, switches and a wall wart yield a simple, accurate ...

The following schematic shows the CMOS implementation of a 2-input XOR gate using complementary pull-up and pull-down networks: Figure: CMOS XOR gate schematic drawn in Cadence Virtuoso. Input A: ...