Tianshui second hand mineral sound machine

1. 1、 Make a pit and fill it with water. Can be unlimited brush water on the line. 2、 Use electrical appliances to power on the instrial pump to pump water. 3. Automatically transfer it to the ore washing field

2. In the early stage of ore radio, we used a needle tip to detect ore (later, we had a germanium diode for better effect) + cobweb antenna + high resistance earphone (high resistance loudspeaker is also OK). When we use a loudspeaker, we can hear it in a small room. There are not many radio stations. The key is that we don't need electricity.

3. Rare is precious. This ore radio should be an antique. It's just like the clothes worn by some stars, which are sold for hundreds of thousands of dollars. It's what abnormal people want. Ore diodes, which have been handed down in history, have some relative weight. Of course, they can be proced if necessary.

4. Connect the ground wire at the middle end of the adjustable double connected capacitor (iron water pipe, building steel bar, lightning rod down lead, etc.) and use high resistance earphone (see the connection method of your earphone socket. You can only use stereo body earphone, just use hood type, but the sound will be very small). For the other terminal (antenna end) of the variable capacitor, you add a 1-2m wire as the antenna.

5. The proction of ore machine can train the hands-on ability of electronic proction. You may as well find some materials to try to complete, the proction process is also a kind of satisfaction. I wish you a smooth proction
a long enameled wire, a PVC pipe as the framework, a al variable capacitor, a 2000p ceramic chip capacitor (can be omitted), and a high resistance earphone (800-2000) Ω, A detector diode 2ap9 or 1N60, a well connected ground wire, and an antenna of sufficient length.

7. Nowadays, high-rise buildings are seriously shielded from radio signals. It should be better to connect an outdoor antenna.

8. There is a mineral radio forum, you can network, which used to sell, now do not know if there is.

9. The signal may be too weak. Why do you play radio now? There is more to learn about electronic technology. Besides, learning should keep pace with the times.

10. Go to Friendship Exchange of equipment; Just post, post photos, price, quantity,