Mine right radio
Publish: 2021-04-15 22:57:19
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.
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. 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.
6. 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.
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.
7. 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
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
8. The ore radio can only receive the signal from the radio station, which has nothing to do with the fact that your home is very close to the TV station
for the antenna of ore machine, it's better to pull a copper wire horizontally, about 10 meters. Both ends should be insulated, not directly fixed on the wall or conctive metal. Such as fixed on the porcelain bottle (insulator), plastic rod, etc. And then connect the wire to the receiver. Simple, with a wire, hanging to the window is also OK, attention, do not touch the wall, lest signal grounding affect the reception.
for the antenna of ore machine, it's better to pull a copper wire horizontally, about 10 meters. Both ends should be insulated, not directly fixed on the wall or conctive metal. Such as fixed on the porcelain bottle (insulator), plastic rod, etc. And then connect the wire to the receiver. Simple, with a wire, hanging to the window is also OK, attention, do not touch the wall, lest signal grounding affect the reception.
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