Special emitters of magnetostrictive type are used to generate ultrasound. The main parameters of devices include resistance and conductivity. The allowable frequency value is also taken into account. Device design may vary. It should also be noted that the models are actively used in echo sounders. To understand the emitters, it is important to consider their scheme.
Device Diagram
A standard magnetostrictive ultrasound transducer consists of a stand and a set of terminals. The magnet is directly connected to the capacitor. There is a winding at the top of the device. A clamping ring is often installed at the base of the emitters. The magnet is only suitable for neodymium type. At the top of the models is a rod. A ring is used to fix it.
Ring modification
Ring devices operate at a conductivity of 4 microns. Many models are made with short stands. It should also be noted that there are modifications on field capacitors. To assemble a magnetostrictive emitter with your own hands,solenoid coil is used. In this case, it is important to set the terminals to a low threshold voltage. It is more expedient to select a ferrite rod of a small diameter. The clamping ring is installed last.
Yar device
Making a magnetostrictive emitter with your own hands is quite simple. First of all, a rack for the rod is prepared. Next, it is important to cut the stand. You can use a metal disc for this. Experts say that the stand should be no more than 3.5 cm in diameter. The terminals for the device are selected for 20 V. A ring is fixed in the upper part of the model. If necessary, you can wind the tape. The resistance index for emitters of this type is in the region of 30 ohms. They work with a conductivity of at least 5 microns. Winding in this case is not required.
Double wound model
Double wound devices are produced in different diameters. The conductivity of the models is at around 4 microns. Most devices have high wave impedance. To make a magnetostrictive emitter with your own hands, only a steel stand is used. An insulator is not required in this case. The ferrite core is allowed to be installed on the lining. Experts recommend preparing an o-ring in advance. It should also be noted that a field-type capacitor is required to assemble the emitter. The input resistance of the model should be no more than 20 ohms. Windings are installed next to the rod.
Radiators on the basereflector
Radiators of this type are distinguished by high conductivity. Models operate at a voltage of 35 V. Many devices are equipped with field capacitors. Making a magnetostrictive emitter with your own hands is quite problematic. First of all, you need to choose a rod of small diameter. In this case, the terminals are prepared with a conductivity of 4 microns.
The wave impedance in the device must be from 45 ohms. The plate is mounted on a stand. The winding in this case should not come into contact with the terminals. At the bottom of the device must be a round stand. To fix the ring, ordinary electrical tape is often used. The capacitor is soldered over the manganite. It should also be noted that rings are sometimes used with overlays.
Devices for echo sounders
For echo sounders, a magnetostrictive ultrasonic transducer is often used. How to make a model with your own hands? Home-made modifications are made with a conductivity of 5 microns. Their impedance is on average 55 ohms. To make a powerful ultrasonic generator with your own hands, the rod is used 1.5 cm. The solenoid winding is wound in small increments.
Experts say that it is more expedient to choose racks for emitters from stainless steel. In this case, the terminals are used with low conductivity. Capacitors are suitable for different types. The limit voltage of the emitters is at around 14 watts. Rubber rings are used to fix the rod. Screwed on at the base of the deviceinsulating tape. It is also worth noting that the magnet should be installed last.
Modifications for fish finders
Fish finder devices are assembled with wire capacitors only. First you need to install the rack. It is more expedient to use rings with a diameter of 4.5 cm or more. The solenoid winding must fit snugly against the rod. Quite often, capacitors are soldered at the base of the emitters. Some modifications are made to two terminals. The ferrite rod must be fixed on the insulator. Tape is used to reinforce the ring.
Low impedance models
Low impedance devices operate at 12V. Many models have two capacitors. To assemble a device that generates ultrasound with your own hands, you will need a 10 cm rod. In this case, capacitors are installed on the emitter of a wired type. The winding is wound last. It should also be noted that a terminal is required to assemble the modification. In some cases, 4 micron field capacitors are used. The frequency setting will be quite high. It is more expedient to install the magnet above the terminal.
High Impedance Devices
High impedance ultrasound transducers are well suited for short wave receivers. You can assemble the device yourself only on the basis of transition capacitors. In this case, the terminals are selected highconductivity. Quite often, the magnet is mounted on a stand.
The stand for the emitter is used in low height. It should also be noted that one rod is used to assemble the device. To insulate its base, ordinary electrical tape is suitable. There must be a ring in the upper part of the emitter.
Rod devices
The rod-type ultrasonic emitter circuit includes a conductor with a winding. Capacitors are allowed to use different capacities. However, they may differ in conductivity. If we consider a simple model, then the stand is prepared in a round shape, and the terminals are set to 10 V. The solenoid winding is wound last. It should also be noted that the magnet is selected neodymium type.
Directly, the rod is applied at 2.2 cm. Terminals can be installed on the lining. It should also be mentioned that there are modifications for 12 V. If we consider devices with high-capacity field capacitors, then the minimum diameter of the rod is 2.5 cm. In this case, the winding must be wound up to the insulation. A protective ring is installed at the top of the emitter. Stands are allowed to be made without lining.
Models with unijunction capacitors
Emitters of this type give out conductivity at the level of 5 microns. At the same time, their wave resistance indicator reaches a maximum of 45 ohms. In order to independently manufacture the emitter, a smallrack. At the top of the stand must be a rubber pad. It should also be noted that the magnet is harvested neodymium type.
Experts advise installing it with glue. Terminals for the device are selected for 20 watts. The capacitor is directly installed above the lining. The rod is used with a diameter of 3.3 cm. There should be a ring at the bottom of the winding. If we consider models for two capacitors, then the rod is allowed to be used with a diameter of 3.5 cm. The winding must be wound up to the very base of the emitter. Tape is glued to the bottom of the drain. The magnet is installed in the middle of the rack. The terminals must be on the sides.
