1,5V Thermometer (CB21280E)

We found this circuit in old documentation from National Semiconductor. The circuit makes use of a sensor from the time.

Basic Voltmeter (CB391E)
This circuits shows how to use in operational amplifier as a basic voltmeter. Power supply must be...
Reinartz Oscillator (CB25318E)
The coils determine the frequency of this oscillator that we found in the January 1996 issue of...
Dolby noise reducer (CB21105E)
This circuit was found in a National Semiconductor Handbook from the 1990s. The integrated circuit...