Generator carrier microwave subcarrier infrasound circuit. Do-it-yourself ultrasonic gun. Neighbors are doing renovations

Operating principle. The circuit is a self-oscillating generator operating at the natural resonance frequency of the loudspeaker suspension system. Since the resonant frequency of the woofer is 40-100 Hz, to reduce it, you simply need to make the suspension system heavier. To do this, in the center of the diffuser you need to glue a spiral of solder weighing about 20 - 40 grams, then the resonant frequency is reduced to 6-15 Hz. It all depends on the brand of the speaker; look up the parameters on the Internet.

Design. The circuit diagram is a simple self-oscillating generator that is started from a speaker coil; I assembled it back in the fifth grade, when I was making speakers. Relay RES 9 at 5V, slowed down by capacitor C1. Actually, this relay is needed to “push” the speaker and turn off; then the circuit operates on the resonance of the speaker coil. Transistors - any low-frequency, medium-power ones, always on radiators (I took two bottoms from aluminum Coke cans). Power supply: 9V bapeshnik from a dead modem. Resistors R1, R4 – volume control - the circuit operates on a pendulum resonance, and although the electrics consume about two watts, the output is at least twenty, and the speaker goes haywire without them. The speaker is, in principle, any low frequency, I have an ancient 10 GD-34 at 10 W, with a 4 Ohm coil, the resonant frequency of the suspension is 80 Hz. Be sure to install it in the housing to prevent an acoustic “short circuit”. The body is a children's plastic bucket. I cut off the ears of the speaker with a jigsaw, stuck them in a bucket and glued Moment around the perimeter.

Setting up - CAUTION INFRASOUND!!! First, you need to assemble the system on the table and check the electrics, first without a weight, when you turn on the power, the speaker should hum at the resonance frequency. I got it working with half a kick. If it doesn’t work, play around with the capacitance of the capacitor. Then assemble the device into a bucket, apply “Moment” to the gaps between the speaker and the bucket, coat the weighting spiral with “Moment” and glue it to the speaker diffuser with “Moment”. Since I could not find a normal frequency meter, I adjusted the “fear frequency” of 13 Hz with an oscilloscope and a low-frequency generator according to the Lissajous figure. To do this, I applied 26 Hz from the generator to one input of the oscilloscope, and the wires from the speaker to the other. Then, in order not to get hit by infrasound, I covered the bucket, turned on the power for five seconds and looked at what happened. Then I turned off the power and began cutting the weighting coil a little at a time until I got a double Lissajous. That's all. I don’t post a photo - a bucket is a bucket.

PS: By the way, I have one more column left. This weekend I’ll try to reduce the size to a minimum, assemble the system into a mini-case with a bass reflex, put it under the hood and test it on the first traffic cop. I’ll post how it turns out..............

Related materials:

The ultrasonic gun is assembled with your own hands using only two logical inverters and has a minimum number of components.

Despite the ease of assembly, the design is quite powerful and can be used against drunken drunks, dogs or teenagers who sit and sing in other people's hallways.

Ultrasonic gun diagram

Microcircuits CD4049 (HEF4049), CD4069, or domestic microcircuits K561LN2, K176PU1, K176PU3, K561PU4 or any other standard logic microcircuits with 6 or 4 logical inverters are suitable for the generator, but you will have to change the pinout.

Our ultrasonic gun circuit is based on the HEF4049 chip. As already mentioned, we need to use only two logical inverters, and it’s up to you to decide which of the six inverters to use. The signal from the output of the last logic is amplified by transistors. To drive the last (power) transistor, in my case, two low-power KT315 transistors were used, but the choice is huge,.

You can install any NPN transistors of low and medium power

The choice of power switch is also not critical; you can install transistors from the KT815, KT817, KT819, KT805, KT829 series - the latter is composite and will work without an additional amplifier on low-power transistors. In order to increase the output power, you can use powerful composite transistors like KT827 - but to boost it you will still need an additional amplifier.

As a radiator, you can use any midrange and high-frequency heads with a power of 3-20 Watts, you can also use piezo emitters from sirens (as in my case).

By selecting the capacitor and the resistance of the tuning resistor, the frequency is adjusted. This self-assembled ultrasonic gun is quite suitable for protecting a dacha area or a private home. But we must not forget - the ultrasonic range is dangerous!

We cannot hear it, but the body feels it. The fact is that the ears receive the signal, but the brain is not able to decode it, hence the reaction of our body.

Collect, test, rejoice - but be extremely careful, and I say goodbye to you, but not for long - AKA KASYAN.

A simple repeller of street alcoholics.

At home, on the mezzanine, there were two old homemade speakers lying around. I took out a low-frequency speaker from one, found in old stashes a circuit that I used to set up bass reflexes in speakers, and within a day I assembled a simple infrasound emitter in a plastic bucket case, tuned to the “frequency of fear.”

In the evening I hung the structure out the window and turned on the power. Five minutes later, the drunkard licked it off like a cow with its tongue.

Now when the noise starts, I turn on the scarecrow for a couple of minutes. In the yard there is peace, quiet and God's grace. And since the entire structure is a megaphone, it “blows” only into the yard, and not into the house. Even my dog ​​doesn’t howl.

Operating principle. The circuit is a self-oscillating generator operating at the natural resonance frequency of the loudspeaker suspension system. Since the resonant frequency of the woofer is 40-100 Hz, to reduce it, you simply need to make the suspension system heavier. To do this, in the center of the diffuser you need to glue a spiral of solder weighing about 20 - 40 grams, then the resonant frequency is reduced to 6-15 Hz. It all depends on the brand of the speaker; look up the parameters on the Internet. Design. The circuit diagram is a simple self-oscillating generator that is started from a speaker coil; I assembled it back in the fifth grade, when I was making speakers. Relay RES 9 at 5V, slowed down by capacitor C1. Actually, this relay is needed to “push” the speaker and turn off; then the circuit operates on the resonance of the speaker coil. Transistors - any low-frequency medium power ones, always on radiators (I took two bottoms from aluminum Coke cans). Power supply - 9V bapeshnik from the dead modem. Resistors R1, R4 - volume control - the circuit operates on a pendulum resonance, and although the electrics consume about two watts, the output is at least twenty, and the speaker goes haywire without them. The speaker is, in principle, any low frequency, I have an ancient 10 GD-34 at 10 W, with a 4 Ohm coil, the resonant frequency of the suspension is 80 Hz. Be sure to install it in the housing to prevent an acoustic “short circuit”. The body is a children's plastic bucket. I cut off the ears of the speaker with a jigsaw, stuck them in a bucket and glued them around the perimeter with Moment. Setting up - CAUTION INFRASOUND!!! First, you need to assemble the system on the table and check the electrics, first without a weight, when you turn on the power, the speaker should hum at the resonance frequency. I got it working with half a kick. If it doesn't work, play around with the capacitance of the capacitor. Then assemble the device into a bucket, glue the gaps between the speaker and the bucket with Moment, coat the weighting spiral with Moment and glue it to the speaker diffuser with Moment. Since I could not find a normal frequency meter, I adjusted the “fear frequency” of 13 Hz with an oscilloscope and a low-frequency generator according to the Lissajous figure. To do this, I applied 26 Hz from the generator to one input of the oscilloscope, and the wires from the speaker to the other. Then, in order not to get hit by infrasound, I covered the bucket, turned on the power for five seconds and looked at what happened. Then I turned off the power and began cutting the weighting coil a little at a time until I got a double Lissajous. That's all. I don’t post a photo - a bucket is just a bucket.

Reviews (6)

Conclusion:
- a circuit with a self-oscillating bridge is not viable due to the very low power in the dynamics and at the same time a large release of this power in the ballast.
- it was not possible to achieve a noticeable reduction in the resonant frequency by adding weight, even without closing the speaker in a box. It will not work in a closed box, even more so - this is taught by acoustic theory.
- as a next step, you can try a speaker circuit with an independent infrasound frequency master oscillator.

Guys, it’s simple, you just need to look at old literature. Wood, when did you make your trumpet? In 1929. When was modulation carried out? In 1902. And in general, read about sound, sound vibrations. For each type of vibration, there is its own design. For infrasonic vibrations, understand organ pipes, understand the work of Tesla with torsion bars. And in general, everything in life is simple there, all this can be done at home and all sorts of different designs, as Wood and Tesla did in their time from practically nothing.

I read your article. I am delighted!! Can you send me a diagram and a detailed description - these alcoholics are already “fed up”... Maybe, under good circumstances, we can set up such “scarecrows” for garden houses - and the thieves in the gardens are already tired (and not me alone)... but an effective method against They haven't been invented yet...

Owner's response

The diagram is in the gallery

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