This old indicator circuit indicates only when the fuel reaches the sensor level. The integrated circuit is not common today. The circuit was found in documentation from the 1980s.
With the used coils and the power transistor this circuit amplifies the 5 W of a 11-meter...
This circuit can be used in PLL, frequency synthesizer in FM and VHF receivers, reducing a...
This circuit is from a Popular Electronics from the 90s. The circuit has a tone frequency...