Published in the September 1973 issue of Radio Electronics magazine, this diagram may be useful to restorers, since the integrated circuit is no longer manufactured.
For those who like experimental circuits, here is a sequential flasher system with LEDs, which can be...
This circuit was found in an ancient American documentation. The integrated circuit is of the time...
This circuit was found in a 1977 Radio Shack documentation. The circuit is tuned to 1.4 kHz, but...