Dynamic microphone handset and amplifier unit

Details Dynamic microphone handset and amplifier unit Dynamic microphone handset and amplifier unit

1988-08-29

1989-07-04

Schreyer, Stafford D.

Telephonic communications

With check operated control

At terminal station

379145, H04M 1700, H04M 166

Patent

active

048457426

ABSTRACT:
A dynamic microphone and dynamic microphone amplifier used with a pay station telephone system has the amplifier physically located within a pay station and includes an isolation transformer to prevent ground faults in the dynamic microphone in the handset from being sensed by telephone network control circuitry. The dynamic microphone amplifier is mounted on a printed circuit board which includes an isolation transformer for the speaker element in the receiver of the handset. The leads from the transmitter dynamic microphone and receiver speaker are connected to the amplifier circuit board by way of a modular pin connector physically located in the pay station housing. The isolation transformers function as ground fault isolation devices to prevent ground faults in the handset from affecting the operation of the associated telephone system and to reduce the risk of electrric shock to a user.

REFERENCES:
patent: 2791634 (1957-05-01), Lomax

Affiliated with

Also associated with

Rating

Dynamic microphone handset and amplifier unit does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Dynamic microphone handset and amplifier unit, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Dynamic microphone handset and amplifier unit will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-858391