NMØS Electronics
DISCOVERY is a HIGH PERFORMANCE crystal radio receiver kit, covering the AM broadcast band. Superb SELECTIVITY is attained through the use of a LOOSE-COUPLED, DOUBLE-TUNED circuit, with two Litz-wire wound, ferrite-loaded tuning inductors. Optimum SENSITIVITY is achieved through the proper application of impedance matching throughout the circuit, including separate Antenna Loading and Tuning controls, and a switched, tapped audio impedance transformer. Kit includes a piezo earphone, but the receiver is usable with any audio transducer 8 ohms or higher.
The kit contains all parts necessary to construct the DISCOVERY receiver. The board is designed to mount in a Hobby Lobby wooden box, SKU# 662536, not included in the kit. Construction requires soldering, but is not difficult, and can be completed in a couple evenings of effort.
This is your opportunity to acquire one of the hard-to-find 1.5" diameter vernier knobs, newly manufactured. While once these were plentiful in radio and electronics stores of the Sputnik era, they, and the stores that carried them, have largely vanished. These though, are highly sought after by crystal radio experimenters and ham radio enthusiasts. Accepting a 1/4" (6.3mm) shaft, this vernier has a smooth 7:1 reduction ratio, and is numbered 0-10. Limited supply on hand. Hardware included.