Buffer 4049 (CB26316E)

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

1800 Hz Decoder (CB20352E)
This circuit decodes a 1800 Hz tone used in communications. The circuit is from an American...
Two megaphones (CB23658E)
These two circuits were found in Radio Electronics magazine from February 1960. The transistor is a power...
PS2 Automotive Power Supply (CB17699E)
With the development and availability of small LCD screens for automotive use, especially in...