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U-Mass Lowell Circuits Lab
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Simple Electrical Circuit pictorial
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Simple Electrical Circuit schematic
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A voltage divider used for volume control.
Block Diagram Drawing
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Standard symbol for a dc voltage source.
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electrical schematic of flashlight
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Resistance symbol and notation.
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Film resistors:
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FIG. 3.25 Color coding for fixed resistors.
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Color-code bands on a resistor
• 1st band is the first digit of the resistance value
• 2nd band is the second digit of the resistance
value
• 3rd band is the multiplier (number of zeros)
• 4th band indicates the tolerance
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Color coding.
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Standard Values of Resistors
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Potentiometer control of voltage levels.
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Potentiometer and rheostat symbols and basic construction of
one type of potentiometer.
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Typical potentiometers and two construction views.
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Common Ground Symbol
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Circuit Ground
• Voltage is relative
• The voltage at one point in a circuit is
always measured relative to another point
• This reference point in a circuit is usually
the ground point
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Voltage sources and grounds
Notation
Ground
symbol Voltage source
symbol
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A simple circuit with ground connections.
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Connections or NODES
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The voltage divider as a bias circuit for a transistor amplifier.
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Symbol for the inductor.
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Typical Inductors
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Symbols for the capacitor: (a) fixed; (b) variable.
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(a) Film/foil polyester radial lead; (b) metalized polyester-film
axial lead; (c) surface-mount polyester-film; (d)
polypropylene-film, radial lead.
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Capacitors
Variable Capacitors Most common are shown in the figure below.
The dielectric for each is air. The capacitance is
changed by turning the shaft at one end to vary the
common area of the movable and fixed plates. The
greater the common area the larger the
capacitance.
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Symbol for a sinusoidal voltage source.
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Function generator.
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Transistors
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Amplifier Output stage
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Timers
LM-555
Experiment
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LM555
Timer
The LM555 is a highly stable
device for generating accurate
time delays or oscillation.
Additional terminals are provided
for triggering or resetting if
desired.
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LM555 Timer pin-outs
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555 Timer Modes
Astable (free-running)
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Astable
Operation
(free-run)
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(a) The 555 timer connected to implement an astable
multivibrator. (b) Waveforms of the circuit in (a).
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Astable Operation (free-
run)
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Astable Operation (free-run)
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Upper threshold
trip point
Lower threshold
trip point
R-S Flip-Flop
(reset - set)
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Astable
Operation
(free-run)
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Elect. Lab. Ball Hall rm. 424
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Sampling Scope
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Scope CRT – Soft Keys
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Inputs & Controls
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Scope Probe, 1 - 10meg. Ohms
have to be used for all scope
measurements
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1X – 10X Probe
Manual Scope Setting