Found in Texas Instruments documentation from the 1980s, this circuit applies to digital signal transmission with FSK modulation. The circuit is slow, as it uses period components.
The filter shown in the figure, suggested by National Semiconductor, only allows frequencies above...
This circuit triggers a warning oscillator if you forget the lights on when you leave the car. The...
This general-purpose two-transistor circuit was found in the November 1993 issue of Electronics Now. The...