



Voltage =
Resistance x Current

Current =
Voltage / Resistance

Resistance =
Voltage / Current

Power =
Voltage x Current






Total Resistance of Series circuit =
Sum of individual Resistances

Current through a series circuit =
Constant

The sum of the individual voltage drops around a series circuit =
The total applied voltage

The total resistance of a parallel circuit =
 The reciprocals of the individual resistances.
 RT = 1/(1/R1+1/R2+1/R3)

Voltage in a parallel circuit =
Constant across each component of the circuit.

Total current in a parellel circuit =
The sum of the individual branch currents

Impedance is the combined effect of:
 Resistance
 Compacitive Reactance (Xc)
 Inductive Reactance (XL)

Capacitive Reactance is measured in ohms and (increases, decreases) as frequency increases.
Decreases

Inductive Reactance is measured in ohms and (increases, decreases) as frequency increases.
Increases

Impedance specifications on loudspeakeres and audio inputs and outputs are specified at a frequency of...
1KHz

Most devices utilize ____ voltage.
DC

Power supplies step down the incoming ____ voltage and convert it to ____ voltage.

Power Supplies that are found in older equipment, are less efficient, easier to service, less complex, more expensive, and more reliable.
Linear Power Supply

Power supplies that are found in almost all new devices, are more efficient, more complex and difficult to repair, less expensive, smaller, and less reliable.
Switching Power Supply


A _______ steps down (or up) incoming ___ voltage to a little in excess.



Provides means of adjusting the resistance within a circuit
Potentiometers

Opposes a change in current
Inductor


Gain expressed in dB:
dB gain = 20 Log (V out / V in)

% Total Harmonic Distortion
Square root of the sum of the squares of the individual harmonic distortion values.
%THD = √[(%2nd)^2+(%3rd)^2...]

When communicating either Sound Pressure Level or Voltage in dB, the following formula should be used:
20 Log (Voltage measured / Voltage reference)

When communicating Power in dB, the following formula should be used:
10 Log (Power measured/ Power reference)

Doubling of voltage = ___ dB
Doubling of power = ___ dB



dBm reference =
1 Milliwatt

Of the semiconductor material types, the ___ type has a deficiency of electrons whereas the ___ type has an abundance of electrons

Opposes current flow in one direction and allows it to flow readily in the opposite direction
Diode



Identify this device and its elements:
Vacuum Tube Triode

The maximum current flow through the plate of a vacuum tube is called...
Saturation

The minimum current flow through the plate of a vacuum tube is called...
Cutoff

The fixed ___ voltage applied to the grid of a vacuum tube is referred to as...
the bias voltage

Class ___ means the tube or transistor is operating during the full 360 degree cycle of the input signal.
A

______ are high gain voltage amplifiers with a differential input and usually a singleended (unbalanced) output.
Op amps


Op amps require what kind of power supply?
Bipolar

The gain factor from op amps =
Feedback resistor / input resistor

Op amps have a very _____ input impedance and a very _____ output impedance.

The rule of thumb for good voltage (signal) transfer is the ______ Z should be on the order of ___x the _______ Z

________ pass high frequencies more readily than lower frequencies.
Capacitors

_______ pass lower frequencies more readily than higher frequencies.
Inductors





Two signals of identical amplitude and phase applied to a differential (balanced) input
Common Mode

Two signals of opposite polarity applied to a differential input.
Differential Mode

An input having both a Hi(+) and Lo() signal input relative to ground that detects only the difference in voltage at the respective inputs.
Differential Input



Name the parts:


