Miniature portable public address system

Details Miniature portable public address system Miniature portable public address system

1976-05-24

1978-05-16

Claffy, Kathleen H.

179 1MG, 179 1VE, H04R 2700

Patent

active

040900339

ABSTRACT:
A portable public address system for use in motor buses which can also be used inside buildings or out-of-doors including a first case and a second case. Within the first case, which is approximately the size of a pack of cigarettes, is an amplifier circuit with a Darlington configuration transistor pre-amplifier, a three-position switch, a volume control and a microphone. Within the second case is a loudspeaker and battery supply which are electrically connected to the amplifier circuit in the first case through the switch.

REFERENCES:
patent: 2572221 (1951-10-01), Voight
patent: 2983791 (1961-05-01), Menarik

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