Popular Electronics Electronic Experimenter's Handbook 1981

"Zap" New Life Into Dead NiCd Batteries, Build An Autoranging Digital Capacitance Meter, Build A Low-Cost A/D Converter, On-Touch Diode Tester, Build A Digital Phototachometer, Six CMOS Circuits For Experimeters, Four Easy-To-Biuld LED Projects, Build A Low-Cost SWR Tester