In addition to output impedance, other specifications are relevant to choosing a headphone amplifier output power, minimum load impedance, and other measurements are also significant.
32.
These formulae apply to a doubly terminated filter ( that is, the source and load impedance are both equal to unity ) with & omega; c = 1.
33.
As the first rheostat increases in resistance, the second rheostat decreases in resistance, keeping the load impedance ( presented at the input of the L pad ) constant.
34.
The phase angle difference between voltage and current of each phase is not necessarily 0 and is dependent on the type of load impedance, " Z " y.
35.
To circumvent this, some power supplies use a linear voltage regulator to maintain the output voltage at a steady value, independent of fluctuations in input voltage and load impedance.
36.
And yes, they need an external source of electrical power to begin working, although with the right load impedance they'll keep themselves powered-up after that.
37.
Certain ribbon and dynamic microphones are exceptions, due to the designers'assumption of a certain load impedance being part of the internal electro-acoustical damping circuit of the microphone.
38.
For vacuum tube amplifiers, impedance-changing transformers are often used to get a low output impedance, and to better match the amplifier's performance to the load impedance.
39.
However typical RF sources such as transmitters and signal generators are designed to look into a purely resistive load impedance such as 50? or 75?, corresponding to common transmission lines'characteristic impedances.
40.
Specifically, a 3-input NOR gate may consist of 3 bipolar junction transistors with their emitters all grounded, their collectors tied together and linked to V cc through a load impedance.
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