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2. Isolation amplifier - Wikipedia

   en.wikipedia.org/wiki/Isolation_amplifier

   An isolated and quasi-balanced input (the floating common is typically connected to the (-) input of a differential amplifier). Suitable for off-ground measurements up to the breakdown voltage of the isolation barrier, and exhibits very good common mode rejection (100 db typical). Differential, floating common. An isolated and balanced input.

3. Phantom power - Wikipedia

   en.wikipedia.org/wiki/Phantom_Power

   It is suitable only for powering microphones specifically designed for use with this type of power supply. Damage may result if these microphones are connected to true (48 V) phantom power through a 3.5 mm to XLR adapter that connects the XLR shield to the 3.5 mm sleeve. [17] Plug-in-power is covered by Japanese standard CP-1203A:2007. [18]

4. Phone connector (audio) - Wikipedia

   en.wikipedia.org/wiki/Phone_connector_(audio)

   The 2.5 mm or sub-miniature sizes were similarly popularized on small portable electronics. They often appeared next to a 3.5 mm microphone jack for a remote control on-off switch on early portable tape recorders; the microphone provided with such machines had the on-off switch and used a two-pronged connector with both the 3.5 and 2.5 mm plugs.

5. Insulator (electricity) - Wikipedia

   en.wikipedia.org/wiki/Insulator_(electricity)

   Insulators made from porcelain rich in alumina are used where high mechanical strength is a criterion. Porcelain has a dielectric strength of about 4–10 kV/mm. [8] Glass has a higher dielectric strength, but it attracts condensation and the thick irregular shapes needed for insulators are difficult to cast without internal strains. [9]

6. Loop antenna - Wikipedia

   en.wikipedia.org/wiki/Loop_antenna

   A quad antenna is a self-resonant loop in a square shape; this one also includes a parasitic element.. Loop antennas may be in the shape of a circle, a square, or any other closed geometric shape that allows the total perimeter to be slightly more than one wavelength.

7. Balanced circuit - Wikipedia

   en.wikipedia.org/wiki/Balanced_circuit

   This is represented in outline in figure 7. The amplifier driving one leg of the line through a resistor is assumed to be an ideal (that is, zero output impedance) single-ended output amp. The other leg is connected from ground through another resistor of the same value. The impedance to ground of both legs is the same and the line remains ...