Monochrome TV Pattern generator (CB9421E)

Using an integrated circuit from the time, this circuit was found in Radio Electronics from the 90s. The ZNA234E is an unusual component today.

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Half Hertz Bandpass Filter (CB25360E)
This 0.5 Hz filter was found in the December 1990 issue of Radio Electronics magazine. The power...
Switching Regulator 78xx (CB15162E)
This circuit was obtained in the SGS manual of linear integrated circuits of 1982. The maximum...
Linear LED Control (CB11573E)
This circuit allows linear brightness control of an LED from an input voltage. The power supply must...