Found in a 1967 Electronic Design, this transistorized circuit compresses and then expands a pulse. The circuit has a double adjustment and the transistors are of the time.
This circuit, found in an American publication from the 1970s, produces an audible tone in a...
This circuit was found in a 2006 publication. It can serve as the basis for a microcontrolled...
By adding a transistor to the output and some polarization features we can obtain a higher output...