This circuit was found in a 1967 Electronics World. We can design it with a BF245 for the FET and a BC558 for the bipolar transistor. The circuit has 3 scales and a 10 M ohm input resistance.
This very simple circuit was found in a 1977 documentation. The L1 coil has 3 turns of AWG wire 22 to...
September 2017 - SparkFun offers through Mouser Electronics its protboard solderless board that...
This sensitive circuit was found in the August 1971 issue of Radio Electronics magazine. The SCR...