3-LED logic probe by Lim Yeen Chen. 2. A detector for metal objects by Chan Yet Nyit. 3. A detector for metal objects by Kok Kok Wah. 4. Build a digital capacitance meter by Yang Chek Pin. 5. Build a headphone amplifier for your guitar by David Lee Kean Chuong. 6. Light flasher unit by William...

by LIM YEEN CHEN
Published 1998