Buffer 4049 (CB26316E)

The purpose of this circuit found in a 1990s Popular Electronics is to increase the current capability of CMOS stages.

Astable 4001 (CB15509E)
The circuit shown in the figure generates a rectangular signal whose frequency depends on C1. For...
Zener and FET Regulator (CB19516E)
This voltage regulator for low current applications (a few milliamps) is from a European...
Lamp Timer (CB21291E)
This circuit was found in a Popular Electronics from the 90s. The circuit uses TTL technology and...