Found in RCA documentation two years 70, this circuit triggers an incandescent lamp at dusk. The circuit uses an LDR of the time.
Texas Instruments' low power operational amplifiers OPAx196 can be found on Mouser Electronics....
This variable power supply uses common components and can supply a current up to 1 A. The...
This circuit was fond in an old publication of the years 1950. The transistors are germanium types and...