TV Pattern Generator (ZNA234E)

  
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) - img1

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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