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2. Current loop - Wikipedia

   en.wikipedia.org/wiki/Current_loop

   To allow the construction of hybrid systems, where the 4–20 mA is generated by the controller, but allows the use of pneumatic valves, a range of current to pressure (I to P) converters are available from manufacturers. These are usually local to the control valve and convert 4–20 mA to 3–15 psi (or 0.2–1.0 bar).

3. Digital current loop interface - Wikipedia

   en.wikipedia.org/wiki/Digital_current_loop_interface

   More than two teleprinters could be connected on a single circuit allowing a simple form of networking. [1] Older teleprinters used a 60 mA current loop. Later machines, such as the Teletype Model 33 , operated on a lower 20 mA current level and most early minicomputers featured a 20 mA current loop interface, with an RS-232 port generally ...

4. List of Arduino boards and compatible systems - Wikipedia

   en.wikipedia.org/wiki/List_of_Arduino_boards_and...

   5 V, output of up to 2 A, 3.3 V, 250 mA LDO voltage regulator; Variable Voltage supply of 1.25 V to 29 V, up to 2 A (Vin - 1 V) Reverse polarity and short circuit protection; 1.8" TFT display screen along with 5-way joystick and a pair of potentiometers, slide switch, and tactile.

5. Voltage converter - Wikipedia

   en.wikipedia.org/wiki/Voltage_converter

   In such cases, voltage converters need only be specified to convert any voltage within one range, to a voltage within the other, rather than separate converters being needed for all possible pairs of nominal voltages (110–220, 117–220, 110–230, etc.)

6. Plugboard - Wikipedia

   en.wikipedia.org/wiki/Plugboard

   A plugboard or control panel (the term used depends on the application area) is an array of jacks or sockets (often called hubs) into which patch cords can be inserted to complete an electrical circuit. Control panels are sometimes used to direct the operation of unit record equipment, cipher machines, and early computers. The array of holes is ...

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