Leak Detector (CB22456E)

We found this circuit in a Popular Electronics from 1992. The transistor is general purpose, assuming equivalent.

Two Level Light (CB16423E)
Although we have already published the complete project of a light on two levels several times,...
Tunable Reject Filter (CB20174E)
This circuit is from the LM107 manual, which is a component of the 80s. The circuit can be adapted to...
Temperature Determined Voltage Reference (CB15600E)
In the figure we present an interesting application suggested by Microchip (www.microchip.com) in which the voltage...