Temperature to frequency converter (CB7325E)

This circuit was obtained in a Radio Electronics of the 90s. The circuit uses an integrated circuit that is not common today.

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Motion Detector (CB4718E)
The purpose of this circuit is to detect the movement of a person by the changes in light that...
Flashing mobile bar with 4017 (CB25434E)
This circuit was obtained from the February 1992 Radio Electronics magazine. In it, a bar of 4...
Constant volume amplifier (CB7095E)
This circuit has an automatic dynamic gain control in a range of 6 dB to 40 dB. We found it in...