High impedance stage (CB20564E)

This high input impedance amplifier stage was found in a 1963 documentation. The transistor germanium of the time.

Logic Level Indicator (CB1300E)
This circuit, found in documentation from the 1990s, uses a common 7-segment LED display. The...
CMOS Touch Switch (CB5065E)
We found this circuit in an early American 80's documentation. We note that the first gate of the...
Temperature sensor with frequency output (CB25386E)
Using a V/F converter this circuit was found in the June 1991 issue of Radio Electronics magazine. The...