Using Maxim components, this circuit consists of a regulator to a boost converter. The circuit operates in the indicated voltage range. The MAX5160M consists of a digital potentiometer.
This circuit is from a factory manual from the 80s. The circuit can be implemented with modern...
Found in a Popular Electronics from the 90s, this theremin is played by the position of the hand...
This simple circuit controls the brightness of an LED from LDRs, NTCs, PTCs or other resistive sensors....