Video mixing circuits ( 2 ) :

• Using the GT4122 & GT4124 Video Mixer ICs - The GT4122 and GT4124 are broadcast quality monolithic integrated circuits specifically designed to linearly mix two video signals under the control of a third channel.   
• Video Effects Unit - Digital AV mixers are available commercially, however these normally cost as much as a good video recorder, which is rather expensive for home use. The Video Effects Unit presented here has a more modest specification, with a more modest price tag! The unit enables the picture to be wiped to black at the end of a track, and then restored at the beginning of the next track. The recording video recorder would be paused once the picture is black, and the pause released just before fading in the next section. This circuit was originally published in Electronics in Action, December 1993   

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