--- product_id: 422748152 title: "Piezoelectric Crystal Earphone Bare Wire (Upgraded Brass)" brand: "protechtrader" price: "NT$770" currency: TWD in_stock: true reviews_count: 13 category: "Pro Tech Trader" url: https://www.desertcart.tw/products/422748152-piezoelectric-crystal-earphone-bare-wire-upgraded-brass store_origin: TW region: Taiwan --- # 20,000Ω High Impedance 200-8,000 Hz Frequency Range All Soldered Brass Diaphragm Piezoelectric Crystal Earphone Bare Wire (Upgraded Brass) **Brand:** protechtrader **Price:** NT$770 **Availability:** ✅ In Stock ## Summary > 🎙️ Hear the Future of DIY Audio – Precision Meets Durability! ## Quick Answers - **What is this?** Piezoelectric Crystal Earphone Bare Wire (Upgraded Brass) by protechtrader - **How much does it cost?** NT$770 with free shipping - **Is it available?** Yes, in stock and ready to ship - **Where can I buy it?** [www.desertcart.tw](https://www.desertcart.tw/products/422748152-piezoelectric-crystal-earphone-bare-wire-upgraded-brass) ## Best For - protechtrader enthusiasts ## Why This Product - Trusted protechtrader brand quality - Free international shipping included - Worldwide delivery with tracking - 15-day hassle-free returns ## Key Features - • **Proven Reliability:** Top-rated with 4.4 stars and trusted by hobbyists who demand consistent, high-quality audio output every time. - • **Crystal-Clear Audio:** High impedance 20,000Ω driver delivers precise sound for your DIY crystal radio and sensitive electronics projects. - • **Tailored for Makers:** Designed specifically for crystal radios, transistor projects, and lab experiments—engineered to elevate your builds. - • **Unmatched Durability:** Brass diaphragm and soldered wiring ensure long-lasting, reliable performance—no more fragile tin or glued parts. - • **Plug & Play Precision:** Pre-tinned bare leads and 3.5mm jack compatibility make integration seamless for any electronics enthusiast. ## Overview The ProTechTrader Piezo Earphone features a high-impedance 20,000Ω piezoelectric driver with a robust brass diaphragm and fully soldered connections, designed specifically for crystal radios and DIY electronics projects. Offering a frequency response from 200 to 8,000 Hz, this in-ear earphone ensures clear, reliable sound with enhanced durability over typical tin diaphragm models. Compatible with 3.5mm jacks and equipped with pre-tinned leads, it’s the go-to choice for makers seeking professional-grade audio components. ## Description desertcart.com: ProTechTrader Piezo Earphone Brass Diaphragm Crystal Radio High Impedance : Electronics Review: Worth the couple of extra bucks! - The first earphone I bought for my crystal radio never worked reliably, and stopped working altogether in no time. After doing some research I found out that there are a couple of problems that are common with most crystal earpieces: 1.) the diaphragm needs to be brass (most are tin) 2.) the wiring inside the earpiece needs to be soldered in order to last (most are glued) This upgraded earphone addresses both of those issues, and buying them made more sense than buying a pack of diaphragms & trying to solder the wires on the other headphone myself, so I was very pleased to find them! The sound is great & the earphone has performed 100% reliably so far, and I expect they will last much longer than the first one I bought. Review: ProTechTrader Piezoelectric Ear Phone High Impedance Ceramic Piezo Ear Piece - Excellent high impedance ear piece. Works very well with entry level crystal radio projects. ## Features - piezoelectric ear phone high impedance - piezo electric crystal earphone - electronics for men - diy crystal radio - electronics ## Technical Specifications | Specification | Value | |---------------|-------| | ASIN | B09MZML96L | | Additional Features | All Soldered Connections, Black wire with bare pre-tinned leads, Brass Diaphram | | Age Range Description | Adult | | Antenna Location | DIY Electronics Projects | | Audio Driver Type | Piezoelectric Driver | | Best Sellers Rank | #316 in Two-Way Radio Headsets & Microphones | | Brand | ProTechTrader | | Brand Name | ProTechTrader | | Built-In Media | Earphone only | | Cable Features | Without Cable | | Color | Beige | | Compatible Devices | DIY Electronics Kits, Crystal Radios, Transistor Sensitive Projects, Lab research, experiments | | Connectivity Technology | Wired | | Control Method | Remote | | Customer Reviews | 4.4 out of 5 stars 73 Reviews | | Ear Placement | In Ear | | Earpiece Shape | Rounded Tip | | Enclosure Material | Metal | | Form Factor | In Ear | | Frequency Range | 200 to 8,000 Hz | | Frequency Response | 8000 hertz | | Headphone Folding Features | In Ear | | Headphone Jack | 3.5 mm Jack | | Headphones Ear Placement | In Ear | | Impedance | 20000 ohm | | Item Weight | 0.01 kg | | Manufacturer | ProTechTrader | | Model Name | Piezo-Brass-Black-Bare | | Model Number | Piezo-Brass-Black-Bare | | Noise Control | None | | Number of Items | 1 | | Sensitivity | 57 db | | Specific Uses For Product | DIY Electronics and Radio Building | | Style Name | Brass Black Wire | | UPC | 789048343323 | | Unit Count | 1 Count | | Warranty Description | 90 Days | | Water Resistance Level | Not Water Resistant | ## Product Details - **Brand:** ProTechTrader - **Color:** Beige - **Ear Placement:** In Ear - **Form Factor:** In Ear - **Impedance:** 20000 ohm ## Images ![Piezoelectric Crystal Earphone Bare Wire (Upgraded Brass) - Image 1](https://m.media-amazon.com/images/I/51rVQMARP1L.jpg) ## Available Options This product comes in different **Number Of Items** options. ## Customer Reviews ### ⭐⭐⭐⭐⭐ Worth the couple of extra bucks! *by J***C on March 11, 2024* The first earphone I bought for my crystal radio never worked reliably, and stopped working altogether in no time. After doing some research I found out that there are a couple of problems that are common with most crystal earpieces: 1.) the diaphragm needs to be brass (most are tin) 2.) the wiring inside the earpiece needs to be soldered in order to last (most are glued) This upgraded earphone addresses both of those issues, and buying them made more sense than buying a pack of diaphragms & trying to solder the wires on the other headphone myself, so I was very pleased to find them! The sound is great & the earphone has performed 100% reliably so far, and I expect they will last much longer than the first one I bought. ### ⭐⭐⭐⭐⭐ ProTechTrader Piezoelectric Ear Phone High Impedance Ceramic Piezo Ear Piece *by J***O on February 1, 2026* Excellent high impedance ear piece. Works very well with entry level crystal radio projects. ### ⭐⭐⭐⭐⭐ This earphone works well *by A***R on December 1, 2025* It works very well. Not real comfortable but in that regard, they’re all about the same. Spend an extra dollar or two. These earphones are pretty good. 👍🏻👍🏻 ## Frequently Bought Together - Piezoelectric Ear Phone High Impedance Ceramic Piezo Ear Piece for Crystal Radios - Upgraded Brass Diaphram with All Soldered Connections - BNTECHGO 28 AWG Magnet Wire - Enameled Copper Wire - Enameled Magnet Winding Wire - 4 oz - 0.0122" Diameter 1 Spool Coil Red Temperature Rating 155℃ Widely Used for Transformers Inductors - BOJACK 1N34A Germanium Diode 50 mA 65V Axial 1N34A 50 millimap 65 Volt Electronic Diodes(Pack of 25 Pieces) --- ## Why Shop on Desertcart? - 🛒 **Trusted by 1.3+ Million Shoppers** — Serving international shoppers since 2016 - 🌍 **Shop Globally** — Access 737+ million products across 21 categories - 💰 **No Hidden Fees** — All customs, duties, and taxes included in the price - 🔄 **15-Day Free Returns** — Hassle-free returns (30 days for PRO members) - 🔒 **Secure Payments** — Trusted payment options with buyer protection - ⭐ **TrustPilot Rated 4.5/5** — Based on 8,000+ happy customer reviews **Shop now:** [https://www.desertcart.tw/products/422748152-piezoelectric-crystal-earphone-bare-wire-upgraded-brass](https://www.desertcart.tw/products/422748152-piezoelectric-crystal-earphone-bare-wire-upgraded-brass) --- *Product available on Desertcart Taiwan* *Store origin: TW* *Last updated: 2026-08-08*