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 can be used as a shield for transmitting the temperature of a sensor. The circuit is from...
We found this circuit in an old manual. The bypass range is 20 MHz and the power supply must be...
This small audio amplifier uses germanium transistors and a 12 V supply. The circuit is from a...