Description

Schumann Wave Generator 7.83-6B released. The Schumann wave generator can help sleep, improve the sound quality, make Schumann wave active water, and is conducive to meditation.

Audio magnetic field receivers are also called AF (audio) receivers and are widely used. This machine adopts the first-stage pre-amplifier, the latter-stage integrated amplifier, the receiving coil is densely wound on the ferrite magnetic material for more than 2000 turns, the sensitivity is super high, and the signal receiving ability is super strong.

This receiver has a wide range of uses:

1. It is used in schools to receive audio signals and for foreign language listening. One student per hand.

2. Detect the wires in the wall/floor: First let the wires pass a certain audio current, because the magnetic field is detected instead of the electric field. The load is preferably those that are not so clean to the power grid, such as dimming desk lamps, energy-saving lamps, etc. After all, the human ear is less sensitive to 50Hz, so it is better to have rich harmonics. Then shake the detector back and forth, and according to the change of the sound of woo woo, you can estimate the position of the inner wire. The error is probably a few centimeters, which is related to the depth of burial. If the wire sheath is that kind of steel pipe, it will not work.

For twisted pair and coaxial cables, direct detection is not very good. But it is not impossible, you need an audio signal generator (the simplest is MP3 or radio, the output is best to be connected with headphones or resistors to avoid burning), and then the twisted pair only uses one of the 8 cores or all 8 cores In parallel, the coaxial cable only uses the outer sheath, and then a long wire is specially drawn to form a current loop, and the detection is the same, as shown in the figure below:

You can also hear whether the ceiling-mounted energy-saving lamps or dimmable incandescent lamps in one of your downstairs bedrooms are on. After experience, I can hear the difference in the sound of energy-saving lamps and thyristor dimming incandescent lamps, huh, huh. The volume of energy-saving lamps of different brands is quite different, and the volume of the lamp with high power is not necessarily high.

Listen to whether there is audio current in the wire: for example, if you debug a device with an RS-232 serial port, it fails, and you doubt whether the data is sent. You don't need to mobilize the oscilloscope, just listen to it with this detector. Why do you say your baud rate is 115.2K, more than audio, can't hear! You can definitely hear it. First of all, 115.2K is the baud rate, not the frequency of the signal. Even if the data is sent at intervals of 01010101, the fundamental frequency is only 57.6KHz. Of course, 57.6KHz cannot be heard by the human ear, but when sending messy data, There must be components less than 20KHz.

Even a signal that does not contain audio components can be "heard" as long as it is strong enough, because it will feel like squelch when you get close, maybe it is blocked.

Of course, you can also listen to the signal of the headphone line, but the external leakage magnetic field of the twisted pair or the closely parallel two lines is small, and it is best to separate the two lines to increase the volume. Listening directly to the earphones, the sound is loud and deafening. Listening to high-impedance headphones with low volume, because high impedance means small current and small magnetic field (small magnetic field refers to the area around the headphone cord, not the headphone coil).

3. Determine whether electrical/electronic equipment is working:

You can listen to whether the remote control of the home appliance is working, press a certain key and there will be a sound, and you can judge whether a certain key is in poor contact, etc.

Near the phone, you can hear some regular sounds, of course, different phones have different sounds. If the mobile phone is playing music or talking, use this device to get close to the mobile phone, and there will be a clear sound of music or a call. Does this mean that in the subway, put the detector in your clothes pocket and hear what cell phone is in the bag that is close to your pl mm? I have a limited number of mobile phone models, and my experience in this area needs to be improved. The main reason is that pl mm is generally not close to the body, so I don't have much interest, huh, huh.

A car two-way remote control should have a frequency of several hundred megabytes. After approaching, you can hear a continuous rustling sound without pressing the button. Maybe the receiving part is super regenerative. If you can't hear it one day, there is a problem.

Large-sized CRT TVs can be heard from a meter away, and LCDs are slightly better. You can hear it if your neighbor's TV or any other electrical leaking magnetic field is a wall away from you. Certainly not the sound of a TV show, but a mix of electromagnetic noise.

In the office, I can hear whether the desktop computer next to the wall is turned on, which is very clever. I also tested it with a laptop. I can hear it next door, but the sound is small, but I can still judge the location of the computer through the wall, and the accuracy is within 1 meter.

So don't look at such a small thing, it is not only an audio magnetic field receiver, but also an audio magnetic field detector, a signal tracker, and a universal detector for judging whether electronic equipment is working.

4. In addition, the developers of the so-called soul receivers that used to sell sky-high prices on the market believe that there is a soul after death, and the soul exists in the surrounding air in the form of electromagnetic waves. Using this audio magnetic field receiver, it may happen to be able to receive To~, if you don't believe me, try it~

The standard for successful debugging of the audio receiver is that the pulse sound can be received at a distance of about 2 meters from the main body of the white photoelectric soldering iron, and the music can be received near the mobile phone that is playing music. This product is hand-made and debugged, and it will not be returned after purchase, please know.