Mineral 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. 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.

5.

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

6. In the past, the ore radio was packaged with instrial wax. Later, the detector diode (PNP) was used to replace the ore. later, the transistor was used to improve the receiver (high amplifier oscillation circuit). Before the intermediate amplifier 1 (including adaptive frequency conversion and intermediate amplifier 2), the detection diode and the front low amplifier were used in the frequency conversion, intermediate amplifier and high amplifier.

7. 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.

8.

The previous "satisfactory answer" does not capture the core of the question (the key point), so it is not the best correct answer

First, a typical ore radio is composed of antenna, tuning circuit composed of inctance coil and capacitor, detector and earphone. There is no difference between the old and the new{ RRRRR} where:

1, the function of the antenna is to receive the radio signal and send the received signal to the tuning loop

The function of the tuning loop is to select the radio station signal we need from many signals received by the antenna

3, the function of geophone is to extract the sound from the radio high frequency

4, the function of earphone is to restore the audio signal from the detector to sound

Second, why is it called "ore radio"? Starting from the "detector", the core device of the detector is a diode. Before the birth of modern crystal diode, people used a diode composed of "ore and a contact wire" as the detector“ "Ore plus a contact wire" is the original crystal diode

So people call this kind of radio ore radio

Third, the ore radio doesn't need electricity because it uses headphones, but because it has no facilities to amplify signals

9. 1. To make a good antenna, it's very long. It's better to use multiple strands of enameled wire, and the best length is tens of meters
2. Detector diode is better
3. To achieve real grounding, the ground wire should be buried well
4 there are not many earphones with high impedance. The ceramic horn can be pressed This is the key)