Audible Direction indicator (CB7116E)

Found in a Popular Electronics from the 90s, this circuit uses a double 555 to emit beeps when the car's indicator is activated.

5 Voltage Level Indicator (CB4892E)
This circuit is based on an uncommon Texas component today, as found in an American 1980s...
Maxim Integrated MAXREFDES67 24 bit Universal Analog Input Micro PLC
Maxim MAXREFDES67 Universal Analog Input Micro PLC is ideal in factory automation because of its...
Piezoelectric Alarm (CB4879E)
When the base of the general purpose transistor is grounded the circuit produces a signal that is given...