3 Pack High Impedance Piezoelectric Earphones 20K Ohm 3.5mm Jack

Build crystal and transistor radio projects with three piezoelectric earphones. Each wired earpiece provides a 20, 000-ohm high-impedance component for matching receiver circuits and inputs. Match the 20, 000-ohm impedance to your circuit prior to connection. The brass diaphragm and fully soldered wire connections ensure consistent construction across all three earphones. The black wire terminates in a 3.5 mm (1/8 inch) audio jack. Verify the jack, connection method, and receiver input before using an earpiece in your crystal radio or electronics project. Use the beige molded in-ear shape where a wired earpiece suits your design.

Its battery-free operation makes each earphone a direct part for compatible radio equipment. Stock three matching earphones for repeated builds or replacements, and the pack supports crystal radio and transistor radio project work. This product is not a toy and is intended for use by teens and adults ages 13 and up