Video line selector

This low-cost line selector is a must for any one working on television and video circuits. The reason is plain: an oscilloscope, even when set to TV field or line triggering, will not usually allow you to study the video content ot one specitic line in the picture. This is simply because it is re-triggered by every next sync pulse instead of a single, user-detined, one. The present instrument ends the hassle in keeping your scope triggered on a video signal. Applications are manifold and interesting as you will soon discover. In particular, the 'invisible' test lines transmitted as an extra service by most TV stations are indispensable for aligning video circuits as well as for bandwidth- and picture-quality assessment.