The circuit shown uses an unusual regulator currently, which is the LM2935, which must be mounted on a heat radiator. The circuit is from Motorola's Linear Interface ICs.
The ZN414 integrated circuit consists of a complete radio from the 1980s. This single receiver...
The circuit shown in the figure uses a programmable unijunction transistor (PUT) of the BRY39 type...
This 1970s RCA circuit can be triggered by light or dark, depending on how the LDR is connected....