This 3 and-a-half digit circuit was found in a Teledyne documentation from the 90s. The circuit uses a thermocouple as a sensor. The integrated circuit used is uncommon today.
This circuit, which controls both the temperature and the level of a liquid in a reservoir, was...
This circuit has a sensitivity of 200 mV providing an RMS power of around 4 W for a load of 8 ohms...
The gain for this circuit is given by the ratio between R2 and R1. The circuit is suggested by...