This circuit for controlling a model of an elevator via wire was found in the December 1997 issue of Electronics Now magazine. DC motors must be rated at the voltage of the transformers.
This circuit uses a resonant reed relay to recognize the frequency of an input signal. Adaptations...
The operational used is uncommon today, but equivalents can be used. Unlike the previous one, this...
This simple circuit uses a zener diode and two LEDs to indicate whether the voltage of a power grid...