(4/4)

006-01 / 20090108 / ec211_sd.fm

• All specifications are subject to change without notice.

SAFETY PRECAUTIONS FOR USING TDK ELECTROMAGNETIC BUZZER

Please be sure to read the specifications of TDK Electromagnetic Buzzer(hereinafter referred to as “the buzzer”) before use.

• Please pay sufficient attentions to the warnings for safe

designing when using the buzzer.

Incorrect usage may cause smoke or fire.

• Do not make sound on the buzzer when it is close to ears.

Listening to the buzzer when it is close to ears, or continuant lis-

tening to it for an extended period, may result in hearing disor-

ders.

Thoroughly warn consumers not to turn on the sound when the

buzzer is close to ears.

• Do not exceed the rated operation voltage range when using the

buzzer.

If it is exceeded beyond the rated operation voltage, a built-in coil

may generate heat, resulting in deterioration of the coil, which

may cause a drop in sound pressure or a change in the terminal

resistance value.

If a rare short circuit occurs due to heat generated in the built-in

coil, a large electrical current flows to the equipment used, pos-

sibly causing it to emit smoke or fire.

• The buzzer is a magnetic type sounder.

Do not use it for any other purpose than a sound generation.

• Do not use the buzzer in other than atmospheric air.

• Do not use the buzzer in the following environments (excluding

cases in which countermeasures are taken).

• Places to be exposed to dust.

• Places where rain, fog, salt water, and the like will get on the

buzzer.

• After installing the buzzer when designing an apparatus, confirm

that there are no abnormalities by performing a reliability

evaluation test.

• Do not exceed the rated operating temperature range when

using the buzzer.

• Do not use for an extended period at relative humidity in excess

of 90% (maximum wet-bulb temperature of 38°C).

• When using the buzzer for a safety device or warning device,

take all surest measures such as providing a safety circuit or the

joint use of another sounder with equivalent characteristics in

order to prevent accidents.

• The buzzer may be influenced by electromagnetic waves,

voltage changes, and ripple voltage.

Check the buzzer in the mounted condition, and take measures

such as safety circuits, shielding, etc.

• If the buzzer is molded or secured by adhesives, thermal

expansion stresses from the mold or adhesive agent may cause

deterioration in a soldered terminal part.

Before molding or securing an adhesive, consider the type,

amount, hardening conditions, adhesive properties, etc., of the

sealing material, and confirm the reliability.

• Do not apply vibrations or shocks (such as dropping) larger than

the specified.

• Do not bend the terminal pin when soldering to install on a circuit

board.

• Do not apply larger than the specified force to the terminal pin.

• Do not apply force to the terminal pin at high temperatures

(when soldering).

• When soldering a terminal pin, perform the soldering in clean

conditions without contamination or rust in order to avoid poor

connections.

• When performing dip soldering directly for installing on a printed

circuit board, be careful so that smoke from the flux, or other

foreign materials, will not get into the sound emission hole.

• Do not clean(excluding products that can be cleaned).

• With regards to devices in which the consumers can touch the

buzzer, thoroughly warn consumers not to put foreign materials

(such as needles, hairpins, garbage, etc.) into the sound

emission hole.

• As the buzzer uses a coil, it has an inductive load.

Protect the drive circuit by putting the diodes in parallel into the

buzzer.

• Do not reconfigure the buzzer.

• Sound pressure changes depending on the shape of the part to

be installed in a device, or the installation location.

Check the buzzer in the mounted condition.

• The buzzer has polarities.

When installing, be careful not to make a mistake with the polar-

ities. Incorrect polarities will cause the following irregularities.

• Without circuit type: Differences in sound pressure will be

created.

• With circuit type: No sound will be generated.

• Frequencies other than the rated frequency will change the

characteristics (sound pressure), and may cause wide

unevenness.

• As the buzzer uses a magnet, it generates a surrounding

magnetic field.

When designing a device, etc., confirm that there are no irregu-

larities due to the magnetic field.

• The characteristics of the buzzer may change because of the

influence of an outside magnetic field.

Check the buzzer in the mounted condition, and take measures

such as shielding, etc.

• Because of deterioration or damage, maintain in rated storage

temperature range, avoid environments where there are sudden

temperature changes, direct sunlight, corrosive gases and dust,

and store wrapped in order to avoid applying stresses.

RECOMMENDED OPERATING CIRCUIT EXAMPLE

Buzzer

R

Q

Oscillator

circuit