[Coco] A little off topic

[Melanie and John Mark Mobley]

How to build a AM Transmitter...

Radio Shack Cat. No. 62-5018
Engineer's Mini-Notebook Science Projects
By: Forrest M. Mims III
Page 42
RF Telemetry Transmitter

You will need:
1) 30 gauge Magnet Wire
2) 1/4" Soda Straw
3) 2N2907 transistor
4) 50k-ohm potentiometer (pot) 
5) 10k-ohm at 25 degrees C Thermistor
6) 10 microfarad capacitor (cap)
7) 1.5 volt battery

This simple low-power Radio Frequency (RF) transmitter will broadcast
temperature as a series of clicks to a nearby radio tuned to the upper end
of the AM broadcast band.

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This book has many science projects...
Electroscope
Galvanometer
Homemade Batteries
Graphite Resistor
Liquid Resistor
Super Capacitor
Thermocouple
Small DC Motor Circuits
Inverse Square Law
Light Listener
Monitoring Sunlight
Electromagnetic Probe
Wind Speed Indicator
Rain Sensors
Electronic Thermometer
Motion Detector
Position Detector
Pressure Sensor
Seismometer
Earth Movement Sensor
RF Telemetry Transmitter
LED Telemetry Transmitter
Electronic Cricket
Analog Data Logger

John Mark Mobley