| Date |
Fact of the Day Topic |
| June 1 |
Electron Attraction and Repulsion Gravity
attracts two electrons towards each other, but their identical negative
charges cause an electrical repulsion ... |
| June 2 |
Signal-to-Noise Ratio (SNR) Signal
and noise can be measured in power, or in rms voltage or current, and
the ratio can be expressed in decibels ... |
| June 3 |
Audio Amplitude Distortion Audio frequency
response gets lots of attention, but amplitude distortion tends to degrade
audio quality more than ... |
| June 4 |
Amplitude Distortion Calculation Waveform
amplitude distortion can be calculated using at least three different
methods. One method is ... |
| June 5 |
External Radio Noise Sources Radio
receivers tuned to any frequency used for communication are subject to
interference from one of more of the ... |
| June 6 |
True Electrical Quantity Measurements True
measurements of electrical quantities such as current, resistance, voltage,
reactance, frequency ... |
| June 7 |
Simultaneously Opposing Currents that Sum Electrical
conduction can occur only if charged particles are available to move
through a conducting circuit ... |
| June 8 |
Liquid Electrical Conduction Electrical
conduction through liquids is called electrolytic conduction. The charged
particles needed to carry ... |
| June 9 |
RF Stub Line Practical Frequency Range Parallel-conductor
or coaxial transmission line stubs or transformer-sections often are
... |
| June 10 |
Waveguide Standing Wave Measurement Electric
and magnetic fields are completely contained by a waveguide, so it is
necessary to insert ... |
| June 11 |
Single Sideband Signal Generation A
common method of generating a single-sideband (SSB) signal is to split
an incoming audio intelligence signal ... |
| June 12 |
Accurate Receiver Selectivity Testing Radio
receiver selectivity generally can be measured most accurately by 1)
tuning both a receiver and ... |
| June 13 |
Two Types of Audio Distortion Audio
can be distorted a variety of ways, but the two most common types of
distortion in AM and FM communication ... |
| June 14 |
Audio Amplifier Negative Feedback A
small amount of the output signal from an audio amplifier can be fed
out-of-phase back to the amplifier input to ... |
| June 15 |
Exceeding Capacitor Voltage Ratings Many
capacitors can be operated at voltages significantly above their maximum
DC voltage ratings ... |
| June 16 |
Electrolytic Capacitor Polarity Most
types of capacitors do not have a specified polarity and they can be
used with either polarity. That is not true of ... |
| June 17 |
Horn Antennas Horn antennas are fundamentally
waveguides that expand in height, width or both to some finite length.
The maximum possible gain ... |
| June 18 |
U.S. HDTV Intolerant of Multipath Europe
and the United States adopted different High-Definition Television (HDTV)
transmission methods ... |
| June 19 |
Transmission Line Mechanical Analogy Imagine
you have one end of an infinite-length rope in your hand. You move your
hand up and down with a ... |
| June 20 |
Feed-Line Mismatch Mechanical Analogy If
a mechanical wave was induced into one end of an infinite length rope,
the wave would propagate ... |
| June 21 |
Electric Shock Effects Some people
think they will be able pull their hands away if they accidentally touch
an electrical conductor charged with enough ... |
| June 22 |
Electric Shock Voltage and Current High-voltage
is dangerous because human contact with high-voltage can cause a dangerous
amount of current ... |
| June 23 |
The First Battery Between 1788 and
1791 Luigi Galvani developed an 'animal electricity' theory after discovering
that a salinated dead frog ... |
| June 24 |
The Origin of Ohm's Law Georg Simon
Ohm was born in Bavaria in 1789. His father taught him philosophy, chemistry,
mathematics and physics ... |
| June 25 |
Wheatstone Bridge Invention Ask almost
anyone who has studied electricity or electronics who invented the Wheatstone
Bridge, an ingenious circuit ... |
| June 26 |
Francis Hauksbee's Experiments You
may have never heard of Francis Hauksbee, but he conducted a series of
brilliant experiments in ... |
| June 27 |
Dynamic Microphone Invention The dynamic
microphone was invented in 1877 by Curttris and Redding working together
in the United States and by ... |
| June 28 |
Wheatstone Bridge Variations From
DC up to about 150 MHz Wheatstone bridges, or other bridges that are
merely modified forms of ... |
| June 29 |
Low Frequency Audio in Small Rooms Audio
buffs know high-fidelity sound systems nearly always produce more bass
in large than in small rooms, but ... |
| June 30 |
Computer Fan Maintenance Computer
reliability is highly dependent on adequate cooling. A large percentage
of computer problems result directly or ... |
