TV Pattern Generator (ZNA234E)

Posted on Sep 20, 2012

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.

TV Pattern Generator (ZNA234E) - image 1
Click here to download the full size of the above Image.

The circuit shown can be connected to a standard UHF TV set with 625 lines (CCIR standard), but by connecting pin 2 to ground instead of +5V, the output will produce 525 lines (EIA standard). In the circuit shown RV1 sets the vertical line width, RV2 sets

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