The circuit we show is part of an article that taught its complete assembly. The article is from the Radio Electronics magazine of August 1983. The thermometer was indicated for automotive applications.
This National Semiconductor circuit appears elsewhere on this site. The circuit must be powered by...
In this circuit the frequency is determined by the coil and the variable capacitor. Transistors like the...
This circuit is from old American documentation, but the transistor used is still very common...