Phone noise canceler (CB9402E)

This circuit was found in a 1967 American documentation. The circuit uses components of the time, applying to analog lines.

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Fire Detector (CB13985E)
This circuit was found in an Italian magazine Elettronica Prática of 1977. The transistors can be...
Wien Bridge Oscillator with AGC (CB14041E)
The presented circuit generates a sinusoidal signal of frequency given by R and C, presenting an...
Car Battery Charger (CB16114E)
Car battery charging can be done very simply with the indicated circuit. Although in the "fast"...