This circuit was found in the February 1981 issue of Radio Electronics magazine. The circuit uses an active component of the time and is suitable for audio signals.
This circuit was found in Radio Electronics from the 90s. It converts capacitance into frequency...
This circuit causes the light of a bicolor LED to change when it is turned on. The time of...
The circuit shown is from a 1994 National Semiconductor documentation and can be implemented with...