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Radio - A head unit that combines a tuner, a preamplifier,
and a power-amplifier. |
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Radio Frequency Interference (RFI) - Electromagnetic
waves between the frequencies of 10 KHz and 300 GHz that can affect
susceptible systems by conduction through sensor (tape head) or
power input lines, and by radiation through space. |
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RAM - Random Access Memory. A memory device that one
can write data to and read data from. |
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Relay (SPDT) - (Single Pole Double Throw Relay) an electromagnetic
switch, consist of a coil (terminals 85 & 86), 1 common terminal
(30), 1 normally closed terminal (87a), and one normally open
terminal (87). |
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Remote Turn On Lead - The lead from the head unit which
supplies a signal (12V+) to the "remote turn on" lead of the amplifier
turning the amplifier on when the head unit is turned on, and
allowing the amplifier to be mounted in a location out of reach
of the user. This is NOT the amplifier's main source of power. |
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Resistance - The opposition to the flow of AC or DC
voltage in an electric current. Measured in ohms. |
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Resistor - An electrical device that resist
the flow of electrical current. The higher the value of resistance
(measured in ohms) the lower the current will be. |
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Resonance - Pitch. When you tighten a drum, you raise
it's resonance. |
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Resonant Frequency - Frequency at which there is a response
peak, due to a specific interaction of inductive and capacitive
circuitry in an audio devise or system. |
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RMS - Root Mean Square. |
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ROM - Read Only Memory. A memory device that one can
only read data from. The data has been pre-programed. |
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