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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

   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 available as a more expensive option. The original IBM PC serial port card had provisions for a 20 mA current ...

4. Neon-sign transformer - Wikipedia

   en.wikipedia.org/wiki/Neon-sign_transformer

   They convert mains voltage in the range 120-347 V up to high voltages, in the range of 2 to 15 kV. These transformers supply between 18-30 mA; 60 mA on special order. [ 1 ] The high-voltage electricity produced is used to excite neon or other gases are used in luminous gas discharge tubes.

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7. Comparison of HP graphing calculators - Wikipedia

   en.wikipedia.org/wiki/Comparison_of_HP_graphing...

   3×1.5 V (4.5 V) AAA: 1999–2003 HP 48GX, HP 48G+ hp 49g+ HP 48G+ (F1630A, F1894A) 4 MHz Yorke (Saturn 1LT8 core) 128 KB RAM, not flashable 131×64 pixel monochrome LCD Entry RPN: Dynamic: RPL: Rudimentary [8] 8-bit RPL character set [9] [10] Buzzer 1×4-pin RS-232, HP SIR: 3×1.5 V (4.5 V) AAA: 1998–2003 [11] HP 48G: HP 49G: HP 48G: 3.68-4 ...

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9. Phase converter - Wikipedia

   en.wikipedia.org/wiki/Phase_converter

   An American Rotary Phase Converter with a Transformer. A phase converter is a device that converts electric power provided as single phase to multiple phase or vice versa. The majority of phase converters are used to produce three-phase electric power from a single-phase source, thus allowing the operation of three-phase equipment at a site that only has single-phase electrical service.