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🎙️ Hear the Past, Power Your Future with Pure Crystal Sound
The ProTechTrader CH905 Piezoelectric Crystal Earphone features a high-impedance 20K-ohm ceramic driver with 42-inch bare wire leads, designed specifically for crystal radios and DIY electronics. It passively converts weak radio signals into clear audio without batteries or amplifiers, making it perfect for vintage radio restoration, signal tracing, and energy harvesting projects. Lightweight and durable, this earphone offers authentic sound isolation and flexible connectivity for professional hobbyists and radio pioneers alike.
| ASIN | B071JWPTT9 |
| Additional Features | High Sensitivity Vintage Style Ear Phone, Piezo Electric 20k ohm Impedance Ear Piece |
| Age Range Description | Adult |
| Audio Driver Type | Piezoelectric Driver |
| Best Sellers Rank | #353,171 in Industrial & Scientific ( See Top 100 in Industrial & Scientific ) #342 in Lab ESD Supplies |
| Brand | ProTechTrader |
| Brand Name | ProTechTrader |
| Built-In Media | Piezoelectric Earphone with Bare Wire Leads for Crystaol Radios |
| Cable Features | Retractable |
| Color | (Beige - Bare Wire Leads) |
| Compatible Devices | Crystal Radios, Transistor Radios |
| Connectivity Technology | Wired |
| Control Method | Touch |
| Customer Reviews | 4.6 out of 5 stars 220 Reviews |
| Ear Placement | In Ear |
| Earpiece Shape | in-ear |
| Enclosure Material | ceramic |
| Form Factor | In Ear |
| Frequency Range | 200 - 8,000Hz |
| Headphone Folding Features | In Ear |
| Headphone Jack | 3.5 mm Jack |
| Headphones Ear Placement | In Ear |
| Impedance | 20000 ohm |
| Item Weight | 6.26 g |
| Manufacturer | ProTechTrader |
| Model Name | Piezo-bare |
| Model Number | Piezo-bare |
| Noise Control | Sound Isolation |
| Number of Items | 1 |
| Specific Uses For Product | DIY Electronics Projects |
| UPC | 789048342869 |
| Unit Count | 1 Count |
| Warranty Description | 1 Year |
| Wireless Technology | RF |
C**0
The voice of the CRYSTAL, still enchanting after 100 years
I build a lot of different types of radios and related stuff. Use these earphones on very basic crystal/fox hole type sets. OK price, decent sound and no issues with any of them. This radio is printed on a FLASH FORGE 3D printer (reviewed on AMAZON), uses coil wire and a germanium diode also from AMAZON. A good ground, a long enough antenna (both with the same coil wire as the coil) and you can listen to local AM broadcasts. No matter how many I make, it is always fun when the static softens and a voice or music is clear. And it is powered purely by the radio waves themselves.
A**R
Used it in a energy harvesting system
Works even with an energy harvesting system
P**N
Great product
Good classic design, quality construction, great price
N**F
Works, but too bit for a human ear canal
I wonder whether anybody has actually gotten one of these to fit inside their ear canal? Maybe I'm doing it wrong, but should be intuitive, right? Put the part that goes into the ear canal into the ear canal, right? I suspect I might have ordered the "elephant" version instead. Admittedly, when I hold it against my ear canal, I can hear my crystal with it, so it must be working.
M**N
Just like when I was a kid
My son recently discovered crystal/trench radios and wanted to try his hand at making one. He asked for a piezo earpiece and this is the one I decided to grab for him. Its just like the one I used when I was his age to make a radio. Worked flawlessly. Grab one and get building a radio!
J**T
Great service and quick delivery...
Good item for the price..
L**E
Good quality
Have used in several different circuits. No problem. Recommend
K**R
Crystal set
I plan on building an old crystal radio, and have gotten all of the components, now gathered. The wire will be to wind a coil, and since the crystal radios are so simple,there is not much to say about the wire other than it is wire,m in the correct diameter, and came quickly and was as expected.
L**R
GOOD qualité
Écouteur à cristal (haute-impedance) pour project, três bonne qualité
O**U
Äußerst empfindlicher hochohmiger Piezo-Ohrhörer
Der Ohrhörer erfüllt 100%ig die Angaben des Herstellers; er funktioniert (korrekte Anpassung wohl vorausgesetzt) sehr gut. - Ich bedanke mich für diesen Artikel. Gruß o.thu
C**S
Quality.
Works as expected.
A**L
As advertised
Worked as advertised.
N**D
A+ Shipping and Item
Received the piezoelectric earphones fast and as described! A+
Trustpilot
1 week ago
1 month ago