Compact Loudspeaker Crystal Radio

This is the compact version of my Loudspeaker Crystal Radio.

Trials on a number of assorted audio transformers, from the junk box, were not in vain. A push-pull output transformer, intended for a 1 W germanium transistor audio amplifier, gave excellent results.

Series-tuned Loudspeaker Crystal Radio - Schematic
The centre-tap on the primary is not used.

A discarded blister pack serves as the base.

Series-tuned Loudspeaker Crystal Radio
In spite of its small size, performance is as good as that of its counterpart.

My 'Homebrew Horn Speaker' and 60' wire antenna offer the perfect match for this crystal radio.