Sound Generator - Jet engine aircraft
This is a simple sound generator to produce jet engine aircraft sounds and it will run on any battery voltage between 3v and 40v.
The circuit will produce 4 sounds : low speed sound of aircraft, high speed sound of aircraft, missile and machine gun. They are activated by connecting pins 12, 13, 14 or 15 to ground respectively.
http://www.ef-uk.net recorder 2 sound files whilst testing the unit the first file is each of the four sounds in order and were recorded with a fixed 430k resistance between pins 10 and 11.
The second file is the low speed sound with manually changed resistor to increase then decrease the engine speed.
Sound Generator circuit schematic:
Related Schematics
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This chip HT2844P not made anymore.