Phone volume amplified circuit ----- Phone Volume Amplifier

Keywords: phone volume amplification circuit Phone volume amplification circuit This circuit is designed for deaf people, JP1 plugged into a telephone handle outlet, the original telephone handle is inserted into the JP2 socket, the switch k1 is normal / deafman using the conversion switch, the location is normal, the acceptance signal is from JP1 Direct delivery to JP2 to headphones, no amplifier, electrical appliances are also cut; when deaf people use, the Dial K1, 6V power supply is added to the amplifier, and the telephone receiving signal is coupled to the LM358 by the transformer T. The output signal is The potentiometer is adjusted to the appropriate volume and send it to the U2 amplification. After the output is sent to the headset by JP2, when the deaf people adjust W to the appropriate volume, when it can be made, the transformer T can be used in the output coupling transformer or radio of the ring circuit in the telephone. Output coupled transformers, the secondary, secondary reverse use is required. In the socket JP1, JP2, the sender wiring should be consistent with the wiring of the selected telephone.

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