The integrated circuit used in this circuit is from the time of publication. The circuit is from a Radio Electronics from October 1987. The triac must be equipped with a heat sink.
This 1970s RCA circuit can be triggered by light or dark, depending on how the LDR is connected....
Found in a 1980s American documentation, this crystal-controlled oscillator generates 100 MHz...
This flasher circuit consists of an astable multivibrator with the frequencies given by the...