Day 120, Monday, 14 March, 2016 Radio Day with Schematics Questions Δ V Antennas Variable Capacitors Variable Inductors Radio Logic Gates.

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Presentation transcript:

Day 120, Monday, 14 March, 2016 Radio Day with Schematics Questions Δ V Antennas Variable Capacitors Variable Inductors Radio Logic Gates

Question 1 1. Why doesn’t an electric eel electrocute itself when it discharges?

Answer 1 The eel is typically 10 times longer than its prey. That means it has 10 3 times the volume (mass). So it is getting about 1/1000 th amps/kg as the prey.

Question 2 2. Frankenstein used lightning to animate his creation (millions of volts). What voltage would be needed to stimulate a cell?

Answer 2 28mV. (Peak action potential of a cell membrane)

It is not the voltage that is dangerous

It’s ΔV that’s important Squirrels cause many blackouts by short circuiting power circuits

Curious but uneducated minds do not mix well with electricity Squirrel guard

Curious and educated minds know no boundaries

Antennas An antenna (or aerial) is a transducer designed to transmit or receive electromagnetic waves. In other words, antennas convert electromagnetic waves into electrical currents and vice versa.

Resonant Frequency The "resonant frequency” and "electrical resonance" is related to the electrical length of an antenna. The electrical length is usually the physical length of the wire divided by its velocity factor (the ratio of the speed of wave propagation in the wire to C, the speed of light in a vacuum). Typically an antenna is tuned for a specific frequency, and is effective for a range of frequencies that are usually centered on that resonant frequency.

Antenna Length ½ wavelength is best

Capacitor 2 plates and a gap A variable capacitor The capacitance limits the frequency of transmitted messages

Variable Capacitors as Frequency Filters

Schematics of a Radio Antenna Variable capacitor (tuner) RF amplifier (transistor) Detector (Diode) Audio amplifier (transistor) Power Amplifier (transistor) Speaker

AM radio

Simple (low power) AM Radio Antenna Variable Inductor (frequency control – high end) Variable Capacitor (frequency control – low end) Diode (detector) Ear Bud

Variable Capacitor

Variable inductor

Speaker

Simple (passive) AM radio

Improvements too the simple AM radio

Circuit Schematics Activity Match the name with the property with the schematic element (picture).

AND Gate

OR Gate

Truth Tables for AND Gates and OR Gates

Credits Capacitor profesanxenxo.iespana.es/electrical/capacitor. jpg Start capacitor

Credits II Squirrel Guard Electrocuted Squirrel photo tml tml Jedi Squirrels joanharvest.files.wordpress.com/2008/02/s quir... squirrels_N.htm

Credits III Variable Capacitor diagram ects/Teaching%20Advanced%20Physics/El ectricity/Capacitors/index.html Variable Capacitor Photo

Credits IV Antennas Wikipedia Resonant Frequency Wikipedia Simple Radio schematics Radio with Loop Antenna schematic schematics.php

Credits V AND Gate Diagram Or Gate diagram