Amplifier for use with telephone transmitter mounted in...

Details Amplifier for use with telephone transmitter mounted in... Amplifier for use with telephone transmitter mounted in...

H - Electricity

04

M

379/82

H04M 1/60 (2006.01) H04M 1/20 (2006.01)

Patent

CA 1210175

AMPLIFIER FOR USE WITH TELEPHONE TRANSMITTER MOUNTED IN HAND HELD TELEPHONE UNIT ABSTRACT OF THE DISCLOSURE An amplifier for use with an electret microphone utilized as a telephone transmitter in a hand held telephone unit or handset. In- corporated into the circuitry is a band pass filter which substantially inhibits feedback "singing" which occurs because of reflection when the handset or telephone unit is placed in a downward position on a hard surface or similar environment. The filter circuitry employs the source resistance of the telephone transmitter and the input resistance of a transistor ampli- fier stage as elements of the included filter circuitry.

453295

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