Rotary Switch-Selectable Timer For Industrial And Domestic Use

The design does not rely on software. By avoiding microcontrollers, the circuit eliminates concerns such as program corruption, debugging complexity, and dependence on specialised tools. As a result, the device remains well suited for harsh environments, long-term operation, and straightforward maintenance. Fig. 1 shows the author’s prototype.

Circuit and working

Fig. 2 shows the circuit diagram of the rotary switch-selectable timer for industrial and domestic use. The device is built around an LM7812 voltage regulator (IC1), a CD4060 CMOS counter IC (IC2), and a few discrete components.