Low temperature sensor (CB7814E)

Found in 90s Radio Electronics, this circuit is indicated for reading temperatures below zero.

Negative Voltage Boost Source (CB1246E )
The circuit shown in the figure is suggested by Micrel, based on the MIC2570 boost voltage...
3-Range FET Voltmeter (CB25570E)
This circuit can work with almost any JFET. The circuit is from an Electronics Now from April...
Automatic Night Light (CB4948E)
This circuit should only be used with incandescent lamps and the SCR should be fitted with a heat...