This circuit was found in Motorola's 1967 documentation. The circuit makes use of power transistors of the time. For pulse pickup an appropriate pickup coil is used.
The circuit, shown in the figure, activates a relay when the logic level applied to its input, from...
The traditional circuit was taken from a French magazine Radio Plans that no longer exists but can...
This circuit makes use of the LM11, 112 or 113 operatives and was found in a 1980s documentation. The...