Abstract: A telephone amplifier for connection to a telephone set and a telephone handset associated therewith, the telephone set having a modular plug receptacle connected to a pair of receiver input signal lines and to a pair of transmitter input supply lines, the handset having a modular plug and cord connected thereto. The telephone amplifier includes a housing mountable on the telephone set. The housing has a modular plug receptacle for receiving the modular plug associated with the telephone handset. The amplifier includes an amplifier modular plug and a cord connected thereto. The amplifier modular plug is adapted for insertion into the modular plug receptacle in the telephone set. The amplifier further includes an amplifier operatively connected to the housing modular plug receptacle and to the amplifier modular plug and cord for amplifying a signal received on the pair of telephone set receiver input signal lines.

Abstract: An amplifier for a telephone handset provided with standard telephone line cord having a pair of receiver input signal lines for direct connection to the handset receiver terminals and a pair of transmitter input lines for direct connection to the handset transmitter terminals. A printed circuit board is electrically connected to and secured to the handset receiver. The receiver input signal lines are directly connected to the printed circuit board without alteration. The input signal is received independently of the receiver input signal line polarity. The transmitter input lines are connected directly to the transmitter without alteration.