FM wireless transmitter
First Claim
Patent Images
1. An FM wireless transmitter, comprising in combination:
- (a) an electronic oscillator mounted to a printed circuit board;
(b) a printed circuit inductances which is part of the frequency determining reactance of an LC circuit and also serves as a radiating antenna;
(c) a metal plate in close proximity to said printed circuit board;
(d) said metal plate attached to a case which surrounds said printed circuit board and forming a capacitance with said LC circuit, where said plate is exchangeable with other plates of varied surface area and casing is interchangeable with other casings having different dimensioned plates attached therein to change the capacitance to thereby vary the resonant frequency of said LC circuit;
(e) an audio input which modulates the frequency of said oscillator, thereby producing a frequency modulated signal; and
(f) a power source for said oscillator.
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Abstract
A FM wireless headphone transmitter which uses a novel technique of varying the transmitted frequency. Instead of the traditional methods of using a variably meshing multi-plate capacitor, the invention uses a printed circuit inductance with a tuning plate attached permanently to the inside of the case so that frequencies are changes by changing cases. An alternative embodiment uses interchangeable tuning plates attached to the inside of the case by hook and loop pile type fastener material. The printed circuit inductance also serves as a transmitting antenna.
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Citations
3 Claims
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1. An FM wireless transmitter, comprising in combination:
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(a) an electronic oscillator mounted to a printed circuit board; (b) a printed circuit inductances which is part of the frequency determining reactance of an LC circuit and also serves as a radiating antenna; (c) a metal plate in close proximity to said printed circuit board; (d) said metal plate attached to a case which surrounds said printed circuit board and forming a capacitance with said LC circuit, where said plate is exchangeable with other plates of varied surface area and casing is interchangeable with other casings having different dimensioned plates attached therein to change the capacitance to thereby vary the resonant frequency of said LC circuit; (e) an audio input which modulates the frequency of said oscillator, thereby producing a frequency modulated signal; and (f) a power source for said oscillator. - View Dependent Claims (2, 3)
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Specification