Found in a Popular Electronics from the 90s, this circuit can be adapted to use modern operational amplifiers. The output voltage is the square root of the input voltage.
This untuned (aperiodic) amplifier circuit was found in the August 1974 Radio Electronics...
This circuit was found in an American 1980s documentation. The integrated circuit used is uncommon...
Found in a 1964 Electronic Design, this circuit makes use of period components. The components are from...