Series-tuned Moulded Inductor Crystal Radio

'A Series-tuned Air-core Coil Crystal Radio' and 'Another Series-tuned Air-core Coil Crystal Radio'


have been made simple by the use of moulded inductors instead of hand-wound coils.   

Moulded Inductor
This makes it possible to use a compact plastic cosmetic jar as a housing.


There is no difference between the two with respect to performance. 

The local 612 kHz, 200 kW AM broadcast station comes in real loud with a 60' wire antenna and sound-powered phones. Headphone current, measured using a 1mA FSD 60 Ω meter, is 625 μA.
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