Temperature to Frequency Converter LM35 or LM34 (CB25447E)

We found this circuit in the March 1992 Radio Electronics magazine. The circuit provides 100 Hz for each degree Celsius or Fahrenheit.

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Headlight indicator 555 (CB9118E)
This circuit warns when the headlight bulb is on. We found it in a Popular Electronics from the...
Variable Active Cycle 4093 (CB15916E)
The oscillator shown in the figure keeps its frequency constant in an active cycle adjustment...
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This circuit was found in an Argentine publication from the 1970s. The circuit can be assembled with...