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.
Recommended for automotive use, this circuit is used to indicate the activation of functions. The...
This very high input impedance preamplifier is from a publication of 1977 but can also be mounted...
This circuit was found in a Popular Electronics of the 90s. The resistor R4 determines the load...