An
easy to build TV pattern generator. It is built around the well known IC,
ZNA234E made by FERRANTI. It produces six different patterns: horizontal
lines, vertical lines, horizontal and vertical lines (cross hatch), white
dots in a black raster, grey scale, and black raster. Ideal for TV service,
and adjustments. The patterns are selected by a six position selector. Operating
voltage: 9VAC. Power dissipation: 130mA. Output impedance:
75Ω.