Found in an Australian documentation from 1991, this circuit was sold in a kit at the time. It is a small FM transmitter with a very common configuration, also found in other projects on this site.
Found in 1960's Radio Electronics, this circuit provides an audio tone that depends on the logic...
A stereo digital mixer using the 4053 is built as shown in figure bellow. The IC must be powered...
This TTL circuit generates a 100 MHz signal for digital instruments. The CI is not easy to obtain,...