This high-impedance piezoelectric earphone connects to crystal radios and other circuits with weak audio output. Use this high impedance crystal radio earphone where a standard earpiece loads the signal too heavily.
Its 20,000-ohm impedance works with passive crystal radio signals without requiring a battery or separate amplifier. The ceramic element responds to the receiver's small audio signal.
A 42-inch twisted black lead ends in two pre-tinned bare wires for soldering or terminal connections. The long cable leaves room to position the earpiece at the bench.
Use the single earpiece for crystal radio builds, transistor radio restoration, lab demonstrations, and signal tracing. Use the bare leads in radio projects or connect them to screw terminals and breadboard jumpers.
One beige earphone comes with two bare wire ends. Add a plug or terminals if your circuit needs them; the radio receiver isn't included.
