Bench thermometer (CB20501E)

With an ultra-low consumption, this circuit can be powered by solar cells. The circuit is from a 1991 documentation.

Micro amplifier (CB23672E)
This three-transistor circuit was found in Radio Electronics magazine from May 1969. The circuit is...
Digital Mixer (CB212E)
A stereo digital mixer using the 4053 is built as shown in figure bellow. The IC must be powered...
Operational Precision Clamp Circuit (CB14420E)
The circuit shown is from a 1994 National Semiconductor documentation and can be implemented with...