Wave Trap filter for crystal radio
This shows a crystal radio add on device called a “Wave Trap”. It helps block out an overpowering radio station so that you can hear weaker stations.
Experiments, inventions, patents, …
by F.E.N. · Published · Updated
This shows a crystal radio add on device called a “Wave Trap”. It helps block out an overpowering radio station so that you can hear weaker stations.
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