[sdiy] Simple Oscillator +Doppler Effect

[Joel Kirchartz]

I'm looking for the simplest, smallest oscillator to opererate around 250 
Hz, with a fairly large amplitude, for a physics project on the Doppler 
Effect (if sound catches up to itself, it will make a sonic boom; AND as a 
sound moves closer or farther away from you the frequency changes)... SO 2 
questions ...

1) Does anybody have a schematic for a cheap & easy (not alot of parts, and 
NO COILS) LOUD oscillator?

2) Do you think the weight of the oscillator+speaker can be supported by a 
Balanced cable, OR should the oscillator & the speaker be separate?

_________________________________________________________________
Say “goodbye” to busy signals and slow downloads with a high-speed Internet 
connection! Prices start at less than $1 a day average.  
https://broadband.msn.com (Prices may vary by service area.)