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2. Time switch - Wikipedia

   en.wikipedia.org/wiki/Time_switch

   A simple 24-hour cyclical electromechanical time switch with a French CEE 7/5 socket. A time switch (also called a timer switch, or simply timer) is a device that operates an electric switch controlled by a timer. Intermatic introduced its first time switch in 1945, which was used for "electric signs, store window lighting, apartment hall ...

3. 555 timer IC - Wikipedia

   en.wikipedia.org/wiki/555_timer_IC

   The 555 timer IC is an integrated circuit used in a variety of timer, delay, pulse generation, and oscillator applications. It is one of the most popular timing ICs due to its flexibility and price. It is one of the most popular timing ICs due to its flexibility and price.

4. Power supply - Wikipedia

   en.wikipedia.org/wiki/Power_supply

   A modern computer power supply is a switch-mode power supply that converts AC power from the mains supply, to several DC voltages. Switch-mode supplies replaced linear supplies due to cost, weight, efficiency and size improvements. The diverse collection of output voltages also have widely varying current draw requirements.

5. Time-slot interchange - Wikipedia

   en.wikipedia.org/wiki/Time-Slot_Interchange

   The switch repeats the algorithm, eventually sending data from any input time-slot to any output time-slot. To minimize connections, and therefore improve reliability, the data to reprogram the switch is usually programmed via a single wire that threads through the entire group of integrated circuits in a printed circuit board.

6. List of telephone switches - Wikipedia

   en.wikipedia.org/wiki/List_of_telephone_switches

   EMS-1 (The ITEC Electronic Modular Switch is an electronic direct control switching system. The modules are combined to form a complete switch or any of the modules can be added to your present Step-by-Step Systems.) EMS-2 (The EMS-2 RURAL SWITCH is a stored program control analog switch designed to be cost-effective in small exchanges.

7. Relay - Wikipedia

   en.wikipedia.org/wiki/Relay

   A relay allows circuits to be switched by electrical equipment: for example, a timer circuit with a relay could switch power at a preset time. For many years relays were the standard method of controlling industrial electronic systems. A number of relays could be used together to carry out complex functions (relay logic). The principle of relay ...