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.
This source allows the supply of laser diodes with voltages above 11 V. The circuit is from French...
This circuit decodes a two-bit value into four outputs (one of four). The circuit must be powered by...
Found in a 1967 Electronics World, this preamplifier uses an integrated circuit from that time,...