We found this circuit in the March 1992 Radio Electronics magazine. The circuit provides 100 Hz for each degree Celsius or Fahrenheit.
This 300 Hz to 3.4 kHz filter was found in the May 1989 Radio Electronics magazine. The circuit...
This circuit used in signaling for boats, cars or barriers was found in a 1980s documentation. It still...
This circuit was found in a NASA documentation from the 1980s. Component values are application...