Bench thermometer (CB20501E)

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

Transformerless converter 220 V (240 V) to 110 V (CB1236E)
This interesting AC / AC converter is only indicated for resistive loads and was obtained in a...
MOSFETs SuperFET III (COM034E)
It can be obtained from Mouser Electronics new superFETs III from Fairchild for voltages of 700 V...
Logaritmic Amplifier (CB3931E)
We found this circuit in an old 1980s documentation. The circuit can be implemented with modern...