Found in an Electronic Design, this circuit makes use of general-purpose bipolar transistors. The circuit can be adapted to operate at lower voltages
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...