If you need a pair of headphones today, you can run down to the dollar store and find some that are quite adequate. Or you can go to Amazon, such as this link of headphones with free shipping, sorted by price.
But sixty years ago, they could be rather pricey. Fortunately, the April 1966 issue of Radio-Television Experimenter showed you how to make a set yourself. The idea is pretty self-explanatory. You started with a couple of two-inch speakers, and the remaining components could be found at a variety of locations. You needed some wire coat hangers, some small plastic enclosures, some padding, and a little bit of ingenuity, and you would be the first on your block with a pair of stereo headphones.
The total cost was said to be $4, and the project would take about three hours.
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Of course, please don’t expect any remarkable sensitivity.
I have an article by a man who was in a Japanese prison camp in China. He made his own detector and headphones. When i read that the headphones had 14,000 turns of wire, i knew i could never do that.
These days, for QRP receivers, i prefer piezo earphones. They’re more sensitive, i submit, and i think i can prove it.