This large crystal earplug is best used for a crystal radio. The delicate solder joint may give out if used with a regular radio. It comes with an 1/8 inch stereo plug. If wired directly into a crystal radio kit use the tip as one conductor and the shaft base as the other conductor. It is built for a high impedance circuit with low power as found in a crystal set.
If you want a smaller, standard earplug try our small crystal earphone.
Stereo tip plug. 6-foot cord.
West Point, PA
February, 23 2016
I purchased two of these because I was intrigued. They were listed as a crystal earphone and they LOOKED like a crystal earphone, but why were they being sold at C. CRANE? They also get mixed reviews. As soon as my order arrived I got out a crystal set and sure enough they worked perfectly. For those who don’t know, a crystal radio has no power source other than an antenna. It uses a tuned circuit and a diode, and needs an earphone or headset of very high impedance. Therefore, a “crystal earphone” is required to hear anything at all. They are extremely sensitive to the tiniest electrical current. As for the mixed reviews, I believe people are using them on transistor radios. A transistor radio is “looking” for an impedance of 8 to 32 ohms at the earphone jack. A crystal earphone is rated at 2000 – 4000 ohms. They have no DC resistance at all. As far as the radio is concerned, there is nothing at all connected to the headphone jack when a crystal earphone is plugged in. I w
Works great with a crystal radio.
Crystal set construction.
SAN FRANCISCO, CA
December, 5 2010
Excelent product thanks