Video modulators ( 17 ) :

• Astec Video Modulator Documentation - This is a four page document of one video modulator module. This document includes full circuit diagram of the video modulator.   
• AV -modulaattori kameralle ja elektreettimikrofonille - This a circuit for an audio/video modulator for PAL system operating at around 55 MHz frequency. It takes in composite video (from video camera) and audio from electret microphone. This circuit include circuit board plans also. The text is in Finnish.   
• Commodore 64 Video Modulator 251025 Schematics - takes in S-video format video + mono audio, outputs S-video, composite video and modulated RF signal   
• Commodore 64 Video Modulator 251696 Schematics - takes in S-video format video + mono audio, outputs S-video, composite video and modulated RF signal   
• LM2998 TV Video Modulator - This IC datasheet also includes circuit diagram of example application circuit.   
• Low Cost Audio-Video Modulator and Transmitter - project report in pdf format   
• MC1374 TV Modulator Circuit - data sheet that includes example circuits, pdf format    Rate this link
• MC1374 TV Modulator Circuit - The MC1374 includes an FM audio modulator, sound carrier oscillator, RF oscillator, and RF dual input modulator. It is designed to generate a TV signal from audio and video inputs. The MC1374?s wide dynamic range and low distortion audio make it particularly well suited for applications such as video tape recorders, video disc players, TV games and subscription decoders. Single Supply, 5.0 V to 12 V operation at Channel 3 or 4.   
• RF Modulator DIY: VHF/UHF TV modulator Elektor january 1985   
• TDA5670 based video modulator - High quality Audio/ Video modulator.   
• TDA8722 I2C-bus programmable modulator for negative video modulation and FM sound - This is a chip datasheet with example circuit diagram. The TDA8722 is a programmable modulator which generates an RF TV channel from a baseband video signal and a baseband audio signal in the event of negative video and FM sound standards (PAL B/G, I, D/K and NTSC).   
• TV Modul�tor - This circuit uses an MC1373 to form a TV video modulator   
• VHF/UHF TV modulator Elektor january 1985 - The TV modulator is made up of two parts, namely a modulatable crystal oscillator and a harmonics generator. The oscillator operates at a frequency of 27 MHz, which is quite low so inexpensive crystals are readily available. The harmonics generator converts the oscillator signal into a sort of frequency spectrum containing all the multiples of 27 MHz up to about 1800 MHz. The TV modulator's output signal is made up of a large number of little peaks, each of which is a complete transmitter signal. At least one of these will always be in band I (VHF channels 2. . . 4), one in band III (VHF channels S. . .12) and many of them will be in bands IV and V (UHF channels 21.. .69).   
• VHF/UHF TV modulator Elektor january 1985 - The modulator output spectrum containing all the multiples of 27 MHz up to about 1800 MHz. At least one of these will always be in band I (VHF channels 2. . . 4), one in band III (VHF channels S. . .12) and many of them will be in bands IV and V (UHF channels 21.. .69).   
• Video to RF Modulator - This circuit is a RF modulator which can be used for moduling of video signal. RF modulated output signal can be received on VHF band ( about 189 MHz ).   

Other video related RF circuits

• Low-cost circuit biases VCOs for cable and TV - PLLs are useful in a variety of applications, most notably cable and TV tuners   
• TV antenna amplifier - covers the frequencies from 40 to 900 MHz   

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