ELECTROMAGNETIC

Solenoid, miniature, differential, noise resistant DEMSH microphone designed to transform sound vibrations into electric vibrations of sound frequencies used in communications equipment and sound reinforcement,

 

While speaking into the microphone coil an alternating EMF, its frequency is the frequency of sound vibrations, thus, there is a transformation of sound vibrations into electrical. DEMSH - a pressure gradient receiver, its membrane is open on both sides. If the sound direction lies in the plane of the membrane, the sound vibrations to the microphone is not sensitive or less sensitive.

 

For efficient operation of the product needs to sound only working on the membrane on one side. In case the sound source is at a distance from the microphone, apply the vibrations to the diaphragm on both sides, so that it remains stationary or sedentary. This provides  noise resistant  DEMSH as noise impact is usually on all sides.

 

Main specifications:

 

Dimensions: 30 x 23 x 10.8 mm;

weight: 14 g;

Sensitivity at 1000 Hz: 0.4 - 1.25mV / Pa;

Frequency range: 400 - 1000 Hz;

Nominal frequency range: 200-4000 Hz;

impedance at the frequency of 1000 Hz: 20 +/- 40 ohms;

module electrical impedance at 1000 Hz: 400-1000 ohms.

Dynamic microphone designed for compact communications equipment in the temperature range  -50 +50 ° C

Main specifications:

 

Dimensions: 36х12,5хØ24  

weight: < 20g;

Sensitivity at 1000 Hz: 0,35 ÷0,9 V / Pa;

Nominal frequency range: 150-7000 Hz;

module electrical impedance at 1000 Hz: 220-350 ohms.

Electromagnetic laryngophone LEM-3 USSR

 

Military performance  ♦

The electromagnetic laryngophone LEM 3 /ЛЕМ-3 /  is designed

for use in communication equipment / tank headsets /

as a speech converter in acoustic noise conditions.

Main characteristics:

Dimensions: 40x20x15mm

Weight: 45g

Nominal frequency range: 300 - 3000 Hz;

Module of electrical resistance at 1000 Hz: 28-52 ohms.