Wireless AC/DC bell

Details Wireless AC/DC bell Wireless AC/DC bell

1996-03-08

1996-12-10

Hofsass, Jeffery

Communications: electrical

Systems

Audible signals

3403847, 3403921, 34082552, 34082572, 116148, 341176, G08B 300

Patent

active

055834779

ABSTRACT:
A wireless AC/DC bell which includes a transmitter circuit, which includes a battery power source, an indicator light, a modulation transistor, and an amplifier, and a receiver circuit, which includes a receiving antenna, a demodulator, an amplifier-rectifier circuit, a modulation transistor, a frequency discriminator, a register, and a speaker starter, wherein the transmitter circuit is driven by a bell button to produce a radio ringing signal; the speaker driver of the receiver circuit is driven to drive a speaker when the receiving antenna receives the radio ringing signal from the transmitter circuit and the received radio ringing signal is processed through the demodulator, the amplifier-rectifier circuit, the modulation transistor, the frequency discriminator, and the register.

REFERENCES:
patent: 4731603 (1988-03-01), McRae et al.
patent: 5291193 (1994-03-01), Isobe et al.
patent: 5365214 (1994-11-01), Angott et al.
patent: 5475369 (1995-12-01), Baker

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