AC voltage probe (CB8185E)

This circuit for voltages up to about 20 V was found in a 90s Popular Electronics. The LED can be of any type or color.

Transistor Bargraph (CB4577E)
This circuit is from a 1995 publication. The components are all common and the number of LEDs may...
Video Switch (CB17054E)
This circuit, found in a 1995 documentation, is intended for switching composite RGB video signals...
Electronic Rheostat UAA1015B (CB15347E)
This circuit is from Motorola's Linear Interface ICs of 1993. The integrated circuit is not common...