Found in a 1991 PE Hobbyst Handbook, this circuit activates an oscillator that deactivates at the end of the programmed time. Transistors are commonly used.
This digital to analog converter circuit was found in the July 1991 issue of Radio Electronics magazine....
This circuit can be used to recognize a tone by its frequency. When this tone is present in a...
Found in an Electronics Now from the 1980s, this circuit is based on grid leakage current for...