Using transistors at the time, this circuit was found in a 1967 Ferranti documentation. The circuit is for 150-ohm transmission lines.
With this circuit, a relay can be activated from an alternating signal with frequency up to a few...
With this circuit the visually impaired can easily locate important places inside the house, such...
In the figure we have the way to use the transistors of an old-paired pair as a trigger circuit. The...