This circuit for cars with fans was found in Silicon Chips documentation from the 90s. It is used to activate the fan when the radiator water temperature rises.
This circuit is suggested by the Linear Applications Handbook of National Semiconductor, being used...
Analog Devices AD7768 24-bit sigma-delta (Σ-Δ) ADCs include an Σ-Δ modulator and digital filter...
This interesting circuit with just 1 transistor was published in Radio Electronics magazine in...