Gene Roddenberry’s original TV series of "Star Trek" broke quite
a bit of new sci-fi ground in its day, with imaginative thought-provoking
stories and a collection of interesting characters: Captain James T. Kirk,
science officer Spock, engineer Scotty ("you canna’ change the laws of physics,
Jim") and so on. Small wonder it spawned a number of spin-off movies and a
follow-on series, along with a huge following of ‘trekkie’ fans who seem just as
dedicated today as they were 30 years ago – no doubt helped by the release of
all the original episodes on DVD.
Fig.1: the circuit uses an HK828 sound recorder chip (IC1) to store two different "Starship Enterprise" door sounds. This drives audio amplifier stage IC2 to replay one of these sounds when switch S1 or S2 is momentarily closed.
Of course, along with those original episodes, many keen
trekkies also like to acquire "Star Trek" memorabilia: replicas of the costumes
worn by the "Enterprise" crew, copies of Mr Spock’s pointy ears, fake phaser
guns and so on. They also like being able to generate some of the distinctive
sound effects which helped make the first series so memorable.
So if you have a friend or relative who’s one of these
dedicated trekkies, you might want to build this project for them – or for
yourself! It recreates the "ssshhhHHHh-thump" sound that always accompanied the
sliding power doors opening or closing on the "Starship Enterprise" and can be
triggered by either pressing a pushbutton or closing the contacts of an external
switch (eg, a reed switch activated by a bedroom door or sliding wardrobe door).
It’s also quite easy to build and can be operated from a 9V battery or 12V