Found in Popular Electronics from the 90s, this circuit consists of a timer that turns off the power of a circuit after a time determined by C1, saving the battery.
The circuit shown is from Motorola's Linear Interface ICs from 1992. The circuit uses a...
This nice function generator circuit with the XR2206 was found in the May 1977 Radio Electronics...
This voltage inverter allows you to raise the voltage of a battery to values as high as 140 V...