This circuit was found in old documentation, however the components used are common today. The selection of times is done by switch and the 556 consists of a double 555.
This circuit is from a 1967 RCA documentation. Components can be replaced with modern equivalents. The...
This circuit was obtained in a 1974 Motorola timers publication. Transistors allow equivalents, the 2N2646...
We found this good power amplifier with the LM12 integrated circuit in the March 1989 issue of...