This circuit was found in a Modern Transistor Workbook from 1965. The circuit sends signals from a small record player to a medium-wave radio placed nearby.
This circuit, shown in the figure, consists of a variable gain amplifier with differential input...
This circuit releases a lock only if the correct 4-digit sequence is entered. The circuit uses...
Found in documentation from the 1980s, this circuit generates signals that can reach a few...