frequency in roll
81Loudspeaker — For other uses, see Loudspeaker (disambiguation). An inexpensive, low fidelity 3½ inch speaker, typically found in small radios …
82WWKB — Infobox Radio station name = WWKB city = Buffalo, New York area = Buffalo and Vicinity branding = WWKB 1520 slogan = A New Voice, A New Choice, The Voice of the New Majority airdate = 1925 frequency = 1520 kHz format = Progressive Talk power = 50 …
83Instrument amplifier — This page is about amplifiers for musical instruments. See also instrumentation amplifier, a type of operational amplifier. An instrument amplifier is an electronic amplifier that converts the often barely audible or purely electronic signal from …
84Electronic amplifier — A practical amplifier circuit An electronic amplifier is a device for increasing the power of a signal. It does this by taking energy from a power supply and controlling the output to match the input signal shape but with a larger amplitude. In… …
85Hang gliding — Hang glider launching from Mount Tamalpais …
86Spread spectrum — Passband modulation v · d · e Analog modulation AM · …
87Subwoofer — A subwoofer is a woofer, or a complete loudspeaker dedicated to the reproduction of bass audio frequencies, from perhaps 150 Hz down as far as 20 Hz, or in rare cases lower. Also known as subs , these are used to augment the low frequency… …
88Low-pass filter — A low pass filter is a filter that passes low frequency signals but attenuates (reduces the amplitude of) signals with frequencies higher than the cutoff frequency. The actual amount of attenuation for each frequency varies from filter to filter …
89Organic light-emitting diode — Demonstration of a flexible OLED device A green emitting OLED device An …
90Mechanical filter — Figure 1. A mechanical filter made by the Kokusai Electric Company intended for selecting the narrow 2 kHz bandwidth signals in SSB radio receivers. It operates at 455 kHz, a common IF for these receivers, and is dimensioned 45×15×15 mm ( …
