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Category: Video Circuits / Modulator Views: 5499 Rank: 0 This circuit shows a Modulator's inner electronics. All these components are covered by the metal box that protects the surounding circuit. visit page. 
Related circuits Two IC rf modulators convert a suitable baseband video and audio signal up to a low VHF modulated carrier-Channel2 through 6 in the U.S., and 1 through 3 in japan-the LM1889 and the LM2889. Both !Cs are identical regarding the rf modulation function, including pin outs, and can provide either... These are modulator circuits for modulation of video signals on a VHF/UHF carrier. The circuits require a 5 V power supply and few external components for the negative modulation mode. For positive modulation an external clamp circuit is required. TV modulator using a motorola MC1374 This one-chip modulator requires some outboard circuitry This circuit shows a Modulator's inner electronics. All these components are covered by the metal box that protects the surounding circuit. Double-sideband-suppressed-carrier-modulator The basic current allows no carrier to be present in the output. By adding offsets to the carrier differential pairs, controlled amounts of carrier appear at the output. The threshold voltage, and thereby the time delay, of a free-running oscillator is shown modulated with a triangular-wave modulation signal Switching diodes are used to fire the neon lamps when negative-peak modulation hits 50. 60, and 100%. To use the circuit, keep an eye on the lamps. The VHF frequency is generated by a tuned Hartley oscillator circuit. Resistors R2, R3, and R4 bias the transistor, with tapped inductor LI and trimmer capacitor Cl forming the tank circuit. Adjusting Cl determines the frequency. Capacitor C2 provides positive feedback from the tank circuit to... Sigma Delta Modulators (Mixed Signal Electronics & Circuit Design)
Simply Digital RF Modulator
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