In this interesting circuit from Popular Electronics, the output voltage is the square root of the input voltage. Equivalent operational amplifiers can be tried out.
This circuit is from 1998 documentation. The circuit causes defects in the ignition system,...
The purpose of this circuit is to power a small fluorescent lamp from from a 12 V battery. The circuit...
Found in a 90s Popular Electronics, this circuit uses two PLL tone recognizers to trigger by touch an...