Build over 60 electronic projects including a finger touch lamp, a metal detector, a transistor radio, and an alarm with the 60-In-One Electronic Playground. Learn about voltage, currents, resistors, capacitors, and much more. Uses spring hook-up method. Build these exciting circuits: Finger touch lamp, Magnetic bridge, Voltmeter, Morse code, Alarm, Electronic noisemaker, Electronic kazoo, Electronic keyboard, AM Transistor radio, Radio announcer, and Metal detector.