Found in the June 1987 issue of Radio Electronics magazine, this circuit uses well-known CMOS components. The circuit has a CMOS amplifier stage that drives a small speaker.
This circuit was found in the January 1989 issue of Radio Electronics magazine. The circuit sends...
This simple audio generator with the 741 was found in a 90sTexas Instruments. The circuit...
In fact, this 1994 circuit uses a scale of LEDs to indicate the pulse rate applied to its input....