Signal transmitter using an active thick film substrate

Details Signal transmitter using an active thick film substrate Signal transmitter using an active thick film substrate

1976-01-07

1977-03-01

Pitts, Harold

Communications: electrical

Digital comparator systems

340171PF, 340384R, 178DIG15, 343228, H04Q 914, H04Q 910

Patent

active

040104478

ABSTRACT:
A battery powered portable acoustic transmitter comprises a plurality of single-pole, momentary contact switches, a type 555 pulse producing integrated circuit chip, and an electroacoustic transducer and matching tuning coil. An RC timing circuit includes a plurality of resistors selectively connectable in the timing circuit by the switches to vary the pulse output frequency. A transistor output circuit amplifies the pulses for driving the transducer. A plurality of diodes supply power to the chip and the transistor output circuit whenever a switch is activated. The integrated circuit chip, resistors, diodes and transistor are part of an active thick film circuit.

REFERENCES:
patent: 3949322 (1976-04-01), Morita

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