---
title: '礦石收音機從無到有'
disqus: hackmd
---

礦石收音機從無到有
===

[TOC]

## 簡介
- 最精簡的礦石收音機電路 (使用[AACircuit](https://github.com/Andy1978/AACircuit)繪製)

        Ant
        \|/
         |
         |
         |
         +-------+------>|-------+  high-Z
         |       |               |  Speaker
         |       |    Low Vf     |
        C|       |    Diode      |  .---|
        C|      ---              +--|   |
        C|      ---                 |   |
        C|       |               +--|   |
         |       |               |  '---|
         |       |               |
         |       |               |
        ===     ===             ===
        GND     GND             GND
                       

- 使運算放大器放的調諧收音機(Tuned RF Receiver)電路 (使用[AACircuit](https://github.com/Andy1978/AACircuit)繪製)

        Ant
        \|/
         |
         |                      VCC
         |                       +
         |                       |
         |                       |
         |                      .-.
         |                      | |
         |                      | | 10M
         |                      '-'
         |                       |
         |                       |     |\                       _
         |       +------|<-------+-----|+\                   __/ |
         |       |                     |  >------+----------| |  |
         |       |    Low Vf     +-----|-/       |       +--|_|  |
         |       |    Diode      |     |/        |       |     \_|
         |      ---              |   OP Amp      |       |
         |      --- 10n          |     ____      |       |   Low-Z
         |       |               +----|____|-----+       |   Speaker
         |       |               |     3K3               |
         |       |               |                       |
         +-------+              .-.                      |
         |       |              | |                      |
         |       |              | | 100K                 |
        C|       |              '-'                      |
        C|      ---              |                       |
        C|      ---              |                       |
        C|       |              ---                      |
         |       |              --- 1u                   |
         |       |               |                       |
         |       |               |                       |
        ===     ===             ===                     ===
        GND     GND             GND                     GND

零件尋找
---

### 天線
由謝老闆製作的[方形還形天線](https://www.facebook.com/honki/posts/10157392140491375)
### 帶通濾波器
#### 電感電容濾波器
- 電感(380uH)/電容(150pF)諧振頻率計算器 [Google搜尋計算器](https://www.google.com.tw/search?q=%282*pi*sqrt%28150pF*380uH%29%29%5E-1)
- 固定電感(900uH為例)計算可變電容(10~150pF)/共振頻率對應曲線[Google搜尋2D繪圖](https://www.google.com.tw/search?q=y%3D%282*pi*sqrt%28x*10%5E%28-12%29*900*10%5E%28-6%29%29%29%5E-1++from+10+to+150)

a. 電感
- 磁棒天線變壓器
- 空氣電感
- 色碼電感
- 工型電感
- 125KHz RFID卡天線(3800uH)

b. 電容

### 檢波器

#### 貓鬚檢波器
[測試報告參考](https://softsolder.files.wordpress.com/2009/01/diy-diodes-nisley.pdf)
a. 從金瓜石採集金屬晶體來製作
- 請參考 [口丁撿石頭](https://hackmd.io/@openlabtaipei/Byf68l1jU)

b. 購買原礦晶體
[萬事問臉書 鍺礦石要去哪邊買？](https://www.latest.facebook.com/honki/posts/10157371157691375)

### 低通濾波器

### 蜂鳴器

## 討論

* [礦物收音機（x）
以礦物為媒介觀世音裝置（Ｏ）](https://www.latest.facebook.com/honki/posts/10157371096951375)
* [礦石收音機又一個坑～](https://www.latest.facebook.com/honki/posts/10157369583891375)

## 參考資料
### 原理說明
* [環保礦石收音機](https://www.masters.tw/138331/crystal-radio?fbclid=IwAR3R3IMZcLXUnMXpVVf3X0XAhWhoI__5BCB8sHgfvy5CH6odMIiW7fFUKUw)
* [一根電線就能當收音機](http://www.masters.tw/62882/%E4%B8%80%E6%A0%B9%E9%9B%BB%E7%B7%9A%E5%B0%B1%E8%83%BD%E7%95%B6%E6%94%B6%E9%9F%B3%E6%A9%9F?fbclid=IwAR2aajmJ63LmUES3O2Q-s_TcDeaKeL1vYJs-J7GR_rUd8V5l4S3KID2nu8Q)

* [FM Crystal Radios 国外矿石收音机 diy 作品](http://www.51hei.com/bbs/dpj-52160-1.html?fbclid=IwAR2nvqrKKhiGeiq1nJjH7Ax7vs-8xcUGtj06cnZEcg2UNyJFRDzxncL4X6E)
* [ACCIDENTAL LED FABRICATION](https://hackaday.com/2010/12/28/accidental-led-fabrication/?fbclid=IwAR3LuFyRijuc7hlZA949iLfmCz8nH-1a0BUpYqM65S_E7QqBGdVXg8pjNmQ)
* [3SK143 FET FM Crystal Radio and regenerative radio](http://theradioboard.com/rb/viewtopic.php?t=6088)

動畫 追逐繁星的孩子 中的礦石收音機
* https://imgur.com/gallery/Wy4As
*https://twitter.com/int_a_gral/status/1043100298653327360/photo/1
* https://www.pinterest.com/pin/4714774579397900/visual-search/?cropSource=6&h=480&w=337&x=10&y=10
* https://www.pinterest.com/pin/765682374135908522/
* https://www.pinterest.jp/pin/146296687880959417/

###### tags: `Crystal` `Radio`