LM3914 with expanded scale (CB24652E)

This LED bar graph circuit was found in the October 1980 issue of Radio Electronics magazine. The circuit shows how to change the LED drive values.

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Home Security System (CB4804E)
In the figure we have a security system consisting of a sophisticated alarm found in a 90s edition...
Audio power meter (CB16052E)
The basis of this circuit is the A / D converter TL505 that feeds an indicator type TIL 321A...
1 Hz Sinusoidal Oscillator (CB14088E)
The circuit presented was found in the 1994 Linear Applications Handbook from National...