High-impedance earphone

Loads & appliances · 2 kΩ · piezo

Magnetic earpiece · 2 kΩ · sensitive enough to hear a crystal radio with no battery

Try it on the benchThe lab drops it on an empty bench and opens its datasheet card.

Typical part: 2 kΩ earpiece

Pins

• Lead 1
• Lead 2

Ratings and limits

How to use it

Hears a crystal radio with no amplifier at all.

Lessons and builds that use it

• Crystal radio

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