Mine radio

1. Ore refers to some metal ores, such as zinc sulfide, which have unidirectional conctivity when contacting with metal wire, and can be used to detect high-frequency signals. Not any ore can be used as a detector. At that time, an article introced the use of sulfur and zinc to make "ore" for detection
there were two kinds of ores used at that time: fixed type and movable type. The fixed type is to adjust the ore and metal contact pin, which can be used when bought back. There is a hole on the shell to move the stylus, because once the ore vibrates, it may lose its detection function and need to be readjusted; The movable ore's stylus has a small handle, which can be adjusted at any time to find the point with the best wave effect
with the emergence of semiconctor diode, because of its small volume and high detection efficiency, no adjustment is needed, and the ore disappears.

2. First of all, you have to prepare some materials. You need a high resistance earphone with a resistance of about 2000 Ω. You can also use a reed horn, a piece of wire (for antenna), a detector tube (ore detector tube or a2p9 tube), a coil, and a variable capacitance of about 250pf. The next step is the proction process: the first step is to make the antenna. You set up a wire about 25 meters long horizontally from the ground. The two ends of the wire should be uninsulated with the erection to avoid signal leakage. In the wire, an indirect lead is connected with one end of your coil, and the other end of the coil is grounded. Then the variable capacitor is connected in parallel with the coil, Then connect one end of the detector tube to one end of the coil antenna, the other end of the detector tube to one end of the earphone, and the other end of the earphone is connected to one end of the coil ground wire. Put on the earphone to adjust the variable capacitance, and you can listen to different radio stations, of course, only a few strong radio stations nearby. If you want to change your listening effect, You can also connect a filter capacitor in parallel with the headset!

3. There are zinc iron ore, galena, pyrite and other ores can be detected, but it is not very stable, the probability of successful proction is not very large. It's better to buy detector diodes, such as 1N60, 1n34, 2ap9 detector tubes, which can be bought on Taobao, and they are very cheap.

4.

A simple ore radio doesn't need power, it works by the tiny current of radio waves

"ore radio" originated from the early geophone elements, which were made directly from natural ore. The commonly used ore is pyrite crystal. When using, a metal probe has to contact a point of the size of a needle tip of the ore, and the contact point with semiconctor effect can be found by adjusting its contact point on the ore

using the semiconctor effect of this point, the AM radio wave is detected to get the audio signal. This kind of radio device is called "ore radio"

extended materials:

features of ore radio. China's old radio enthusiasts who have played ore machine should remember 2ap9, a diode model full of nostalgia

a simple ore radio can be composed of only one coil, variable capacitor, detector and earphone, which is called "single loop ore radio" because it has only one tuning circuit

when such a machine is equipped with a good sky and earth line, it can accept local or slightly distant radio stations, but the ability (selectivity) of separating radio stations is very poor, and "clip" often occurs, that is, two or more radio stations ring together

in addition to this simple form, there can also be two or even three circuit ore radio to improve the selectivity, but there is no big improvement in the volume. There is also a new type of MOSFET for detection, which can achieve a voltage drop close to 0 V. this kind of element has excellent detection effect for ore radio

5. I'm afraid ordinary speakers are not good, so we should use high impedance earphones. There is a forum ore radio, there are tutorials and many fans, it is recommended to see.

6.

The turntable is a variable capacitor. The coil is from the radio you removed. It is wound around a gray thing that can be absorbed by a magnet. There are many wires on it, which are connected to the variable capacitor; That diode is 2ap9. It's hard to find it now. Use in60 or other Schottky diodes. Some of these diodes are sold in

pictures. I can't understand it in a word. I'd better go to the "ore radio" forum to have a look

7. 1N60 detector diode
mobile phone headset
5V / 220V transformer
0.3mm enameled wire
a long antenna
ground wire - ground.

8. 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.

9. Ore refers to some metal ores, such as zinc sulfide, which have unidirectional conctivity when contacting with metal wire, and can be used to detect high-frequency signals. Before the application of semiconctor diode, it can be used for detection, but its detection efficiency, working stability and other indicators are far lower than those of 2AP germanium diode, which was completely replaced in the 1960s
it is either used as a power supply or capacitor, or a "poor quality germanium diode"
the ore radio is an antenna loop. After tuning, it is connected to the ore detector, and then the earphone is pushed to listen. Where the radio signal is very strong, the tongue spring loudspeaker with high sensitivity can also be used to make sound.