Miner's 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.

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

3. 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.

4. You mean & quot; Ore & quot; Or & quot; Kuangshi & quot; Ah
ore radio today, we are used to refer to those radios that do not use power and only have one semiconctor component in the circuit as "ore radio"“ "Ore radio" originated from the early geophone element, which was made directly from natural ore. when it was used, it had to adjust its pressure and orientation on the ore through a metal probe. Ore radio is the simplest of all radio receiving equipment. Unless it is quite close to the radio station, the erection of its antenna and ground wire is very elegant
ore radio is a kind of passive radio without amplification circuit, which is composed of antenna, ground wire, basic tuning circuit and ore detector. It is the simplest radio receiving device, mainly used for the reception of medium wave public radio. It was originally made of ore, so it got its name
when the transistor was invented, radio enthusiasts used germanium diodes instead of minerals. 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, geophone and earphone. Because it has only one tuning loop, it is called "single loop ore radio". Such a machine can accept local or distant radio stations when it is equipped with good ground and sky lines, but the ability (selectivity) of separating radio stations is very poor, There is often a "clip", that is, two or more radio stations ring together
in addition to this simple form, there can also be two or even three loop ore radio to improve the selectivity, but there is no big improvement in the volume. Now there is also a new type of MOSFET for detection, which can obtain a voltage drop close to 0 V. this kind of element has excellent detection effect for ore radio< Excellent ore radio needs: excellent ground wire, high Q value coil and variable capacitance, detector with low forward voltage drop, sensitive earphone with good impedance matching
2. The broadcast can still be heard in case of power failure or no battery
3. It can be used to test the efficiency of antenna or ground wire
4. Ore machine is very attractive and can be used to guide beginners and children into the world of radio, radio and DIY
5. The circuit is simple and easy to make
6. Connect the power amplifier to receive the AM broadcast with the best sound quality
7. It can be used for life without maintenance cost.

5. As early as the 1960s, tuning coils and tuning capacitors of ore radios were sold. The coils are kraft paper coils, about 40mm in diameter, without magnetic core, and the variable capacitance is 7-360pf. A long antenna, a tunable ore, a high resistance earphone, and without battery can receive several sets.
the frequency of the tuned radio can be tracked to achieve resonance [the same frequency], In order to improve the received signal strength, the self winding inctance is required, but the tolerance is very large. If the coverage range is not appropriate, more winding can be done, and the tap can be drawn out.
now the coil with magnetic rod can be selected. If it is self-made, seven 0.1 enameled wires can be twisted into multi strand wires for flat winding. The primary winding is 70-80t, the secondary winding is 10t, and the distance is about 5mm, with 7-270pf variable capacitor, The range that can be received by detector diode is medium wave

6. The simplest ore radio only needs a diode, a variable capacitor and a headset. I played it when I was a kid.

7. 1. Ore machine forum
http://www.cnham.net/bbs/List.asp?BoardID=3
2. Ore radio stores the energy of radio waves in the air through inctors (capacitors) connected in series in the antenna, Then the energy in the inctor (capacitor) of ore or detector diode (2ap9, etc.) is converted into voltage and current to drive the earphone to proce sound http://www.cnham.net/bbs/Show.asp?id=8488&BoardID=3&TB=2

8.

In addition to being used in ore radios, magnetic rods can also be used in multi tube AM band and medium wave band radios

in addition, if you don't care about the size, you can also change the coil of the magnetic rod to make an inctor for the filter circuit. The number of turns and groups of coils can also be changed for boost circuit or buck circuit

● I hope my answer can help you

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9. We need to use multi strand wire to wind ore radio, but we can't use single strand wire.
it's estimated that it's difficult to close ore machine now, and the noise in medium wave band is too big

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