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2. File:DPDT-symbol.svg - Wikipedia

   en.wikipedia.org/wiki/File:DPDT-symbol.svg

   This circuit diagram was created with Inkscape. This SVG circuit diagram shows a very simple image. Drawing uncomplicated graphics with a text editor seems more adequate than using a vector graphics program, and will often result in a dramatic reduction of file size.

3. Electronic symbol - Wikipedia

   en.wikipedia.org/wiki/Electronic_symbol

   An electronic symbol is a pictogram used to represent various electrical and electronic devices or functions, such as wires, batteries, resistors, and transistors, in a schematic diagram of an electrical or electronic circuit. These symbols are largely standardized internationally today, but may vary from country to country, or engineering ...

4. Relay - Wikipedia

   en.wikipedia.org/wiki/Relay

   Circuit symbols of relays (C denotes the common terminal in SPDT and DPDT types.) Since relays are switches, the terminology applied to switches is also applied to relays; a relay switches one or more poles, each of whose contacts can be thrown by energizing the coil. Normally open (NO) contacts connect the circuit when the relay is activated ...

5. Multiway switching - Wikipedia

   en.wikipedia.org/wiki/Multiway_switching

   Systems based on relays with low-voltage control circuits permit switching the power to lighting loads from an arbitrary number of locations. For each load, a latching relay is used that mechanically maintains its on- or off-state, even if power to the building is interrupted. Mains power is wired through the relay to the load.

6. Relay logic - Wikipedia

   en.wikipedia.org/wiki/Relay_logic

   In many cases, it is possible to design a relay logic diagram directly from the narrative description of a control event sequence. In general, the following suggestions apply to designing a relay logic diagram: 1. Define the process to be controlled. 2. Draw a sketch of the operation process. Make sure all the components of the system are ...

7. H-bridge - Wikipedia

   en.wikipedia.org/wiki/H-bridge

   One way to build an H-bridge is to use an array of relays from a relay board. [3] A "double pole double throw" (DPDT) relay can generally achieve the same electrical functionality as an H-bridge (considering the usual function of the device). However a semiconductor-based H-bridge would be preferable to the relay where a smaller physical size ...

8. Ladder logic - Wikipedia

   en.wikipedia.org/wiki/Ladder_logic

   Ladder logic was originally a written method to document the design and construction of relay racks as used in manufacturing and process control. [1] Each device in the relay rack would be represented by a symbol on the ladder diagram with connections between those devices shown.

9. Reference designator - Wikipedia

   en.wikipedia.org/wiki/Reference_designator

   A reference designator unambiguously identifies the location of a component within an electrical schematic or on a printed circuit board.The reference designator usually consists of one or two letters followed by a number, e.g. C3, D1, R4, U15.