Circuit Of Induction Telephone Loudspeaker

Published:2011/4/20 9:36:00 Author:TaoXi | Keyword: Induction, Telephone Loudspeaker | From:SeekIC

In some cases such as the telephone conference, we need to amplify the voice of telephone to lots of people, and we need to record the contents from the telephone. This circuit can simultaneously satisfy both of these requirements, do not need to make any changes, just put it near the telephone. When the voice current through the coil inside the telephone, there is a magnetic field in the vicinity, so If you put a coil L at both ends, the magnetic field will induce the signal voltage, then amplify the signal to amplify the voice of telephone to lots of people. Telephone inductive amplifier circuit is as shown, coil L will be converted the leakage magnetic field of voice into the electric signal, then controlled by potentiometer RP1 to get into the pre-formed amplifier stage that is composed by the transistor VT1, through the capacitor C4 and the potentiometer RP2 to get into the power amplifier stage to be amplified by the IC1 (audio integrated amplifier LM2896), output signal of pin IC1 promote sound speaker BL1 to make sound.



Reprinted Url Of This Article:
http://www.seekic.com/circuit_diagram/Audio_Circuit/Circuit_Of_Induction_Telephone_Loudspeaker.html

Print this Page | Comments | Reading(3)