RTD Temperature Meter (CB25463E)

This circuit with RTD sensor was found in the Radio Electronics magazine of April 1992. At the output we have 1 mV for each degree Celsius.

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1-Transistor Regenerative Receiver (CB23870E)
We found this simple circuit with headphones listening in Radio Electronics magazine from March...
Low voltage indicator (CB9550E)
This circuit indicates when the voltage of a 12 V battery is low. With changes, for example, the...
Second order active voice filter (CB7568E)
This filter for the 300 Hz to 3 kHz range was found in an American documentation from the 90's....