Buffer 4049 (CB26316E)

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

VHF Preamplifier (CB21209E)
This circuit for receivers was found in an American documentation from the 90's. The circuit...
Pulse modifier (CB8035E)
This circuit found in an American documentation from 1964, alters the duration of a pulse and can...
Improvised 110 V to 220 V Transformer (CB13499E)
In the figure we have the way of obtaining 220 V from two equal 110 V transformers or 230 V from...