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.

Series-tuned Moulded Inductor Crystal Radio

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

Moulded Inductor

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

Series-tuned Moulded Inductor 
Crystal Radio - Schematic

Another Series-tuned Moulded
Inductor Crystal Radio - Schematic

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

The performance of a parallel-tuned version is also quite good with a headphone current of 300 μA.

Parallel-tuned Moulded Inductor
Crystal Radio - Schematic

Related post: Another Series-tuned Air-core Coil Crystal Radio
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