Instructions

ManualsBrandsMAKERFACTORY ManualsLeisure & HomeCourse material MAKERFACTORY Ultraschall Ei 15051 14 years and over

ULTRASOUND

Sound waves require a medium - gas, air or a liquid - to travel at differ-

ent speeds. If a sound is produced by a loudspeaker, the loudspeaker

membrane causes the surrounding air to vibrate.

The air pressure changes in the rhythm of the membrane oscillation.

This air pressure fluctuation spreads in all directions. The velocity of

propagation in air is approx. 343 m/s (1,235 km/h).

The frequency of the oscillation indicates how often the air pressure

fluctuates per second. The corresponding unit is Hertz (Hz). A high tone

has a high frequency, a low tone a low frequency.

The sound audible to humans is in the range between 16 Hz and 20,000

Hz (20 kHz).

Infrasound is located below the 16 Hz limit. This is often caused by

explosions or thunder, for example.

Frequencies above 20 kHz are referred to as ultrasound. These are audi-

ble to animals, for example.

The ultrasonic egg operates at a frequency of 40 kHz.

THE BOARD

The circuit board contains an ultrasonic transmitter (oscillator) and a

powerful amplifier. You will connect all other components - ultrasonic

transducers, LEDs, adjustable resistors and the battery to this.

WIRE AND PLASTIC PLUGS

A long wire and fourteen plastic plugs allows for the right connections.

The plugs fit into the 4 mm holes of the board on which you can clamp

wires and connections of the LED and trim pot on the side.

Depending on the circuit layout, cut the wire into suitable pieces, strip-

ping off the ends.

TWO ULTRASONIC TRANSDUCERS

One of the converters is called 40T. It's what you need to transmit ultra-

sound. The other transducer is called 40R. It receives ultrasound. The con-

verters have two connections. The connection, which is directly connected

to the metal housing, is usually connected to the GND when installed on

the board. GND corresponds to the minus pole of the battery.

LIGHT EMITTING DIODE (LED)

The LED is connected with plastic plugs to the spot provided on the cir-

cuit board. It has two connections. The shorter connector is located on

the flattened side of the LED housing. It is connected to the GND.

ADJUSTABLE RESISTANCE (TRIM POT)

ULTRASONIC EGG

Build your own distance warning system

Discover the fascination of ultrasound

Exciting experiments with ultrasound

Front

Back

Oscillator

Amplifier

Front view

Summary of content (4 pages)

PAGE 1
THE BOARD Front Back Oscillator Amplifier ULTRASONIC EGG The circuit board contains an ultrasonic transmitter (oscillator) and a powerful amplifier. You will connect all other components - ultrasonic transducers, LEDs, adjustable resistors and the battery to this. Build your own distance warning system Discover the fascination of ultrasound Exciting experiments with ultrasound WIRE AND PLASTIC PLUGS A long wire and fourteen plastic plugs allows for the right connections.
PAGE 2
Connect the trim pot to the circuit board using the plastic plugs. You need it to calibrate the ultrasonic transmitter or adjust the sensitivity of the amplifier. To be able to operate the trim pot comfortably, connect the contact at the curve of the component to the circuit board using a slightly shorter plastic plug. The three holes on the right side of the board must be exactly above the three holes in the plywood board. If you like, you can glue the board using the four adhesive pads.
PAGE 3
You can change the oscillator frequency by turning the thumb wheel of the trim pot. In this experiment, however, it will have no effect on the function. If you connect the input of the display unit to one pole of the battery, the LED will not shine. It is important that an alternating voltage signal reaches the input of the signal unit. The ultrasonic transmitter generates this signal, not the battery. Then connect this construction to the corresponding connectors on the board.
PAGE 4
DISTANCE WARNING SYSTEM 1 The trim pot and the 40T converter remain connected to the oscillator as in the previous experiment. The 40R converter connects to the amplifier input. The terminals connected to the metal housings of the converters must be connected to GND. The LED is connected using plastic plugs to the spot provided on the circuit board. "LED in" is connected to the output of the amplifier. After connecting the battery, the LED may shine or blink.