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High Impedance Piezoelectric (Crystal, Ceramic) Earphones.
All earphones are tested.
Impedance: 20 Mohm.
Capacitance: 15,000 pF.
Sensitivity: -57 db @ 1 KHz.
Frequency Range: 200 - 8,000 Hz.
Wire: Approx. 101 mm molded twisted wire.
Connector: 3.5 mm mono jack.
Piezoelectric earphones also known as crystal earphones or ceramic earphones are the most sensitive devices. They are many times more sensitive than the most sensitive magnetic earphones that you may use. Sensitive earphones have a very high impedance, which is measured in ohms and should not be used directly with a modern amplified radio. Crystal earphones are so sensitive and require so little power to operate that you can hear a small 'click' just by touching the two bare leads together or shorting the jack connector.
Crystal earphones are used in the construction of the crystal radio and in some science experiments.
SHIPPING & HANDLING:
Regular Mail: Worldwide.
Registered Mail (optional): Add to Regular Mail US$ 2.70 (Worldwide).
Tracking number only available through registered mail.
Tell me as soon as possibly if you prefer registered, so I can invoice you correctly. Para Portugal: Antes de pagar por favor avise e não faça pagamento automático. Existe um desconto nos portes. Seller is responsible only for items sent under registered mail.
Items sent under regular mail are from the Buyers risk and responsibility. Payment for this sale must be received within 7 days from sale closing.