TV Pattern Generator by ZNA234

This Circuit uses the ZNA234E IC which makes available all the waveforms necessary to produce the crosshatch, dot and greyscale test patterns on a television screen. The composite video output can be injected directly into the video input of a receiver or used to drive a modulator for connection to the aerial socket.

Source:http://www.next.gr/inside-circuits/
TV-Pattern-Generator-ZNA234E-l5860.html

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