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Nice find @allObjects, Hum along . . . Clap On, . . . Clap Off
and they are still sold, forty years later!!
Now I can't get that ear worm out of my mind ;-)
Quite a simple circuit, isn't it.
1985
The switch was designed to respond to a specific acoustic signal: two claps. Joseph Pedott, founder of Joseph Enterprises, Inc., began selling the Clapper in 1985. (You've probably heard of Joseph Enterprises' other super-popular invention, The Chia Pet.)https://www.amazon.com/Clapper-Activated-Detection-Appliances-Technology/dp/B0000CGKLR
Robin
@barry_b_benson, take a look at this pub https://pub.tik.ee.ethz.ch/students/2013-FS/GA-2013-03.pdf - also attached as pdf.
What I notice is that many clap switches need two claps for one toggle. All switches use some kind of amplifier to create a sufficient voltage top get digital electronics triggered... (as @Robin points out). Attached schema seems quite simple - 3 resistors, 1 capacitor and a single transistor. The reference is found in the initial pub in the literature summary, and is http://embedded-lab.com/blog/making-a-simple-clap-switch/