Also called the receiver, SPK receiver

The receiver (also called receiver, SPK): a sound leakage (or according to the standard ITU type 3.2 high / low leakage ring) the audio signal into sound signal under the condition of electro acoustic devices, widely used in mobile phone, telephone equipment, audio (voice, music playback). It is normal to measure several standards: A. measured resistance for 30 euro B.6 ~ 10 euro C.110 ~ 150 euro D. regulated power supply with 1.5V to both ends of the red line and black line contact phone 3V power line will make noise