This resistance meter circuit was found in the February 1984 issue of Radio Electronics magazine. It is based on a digital module from that time. The power supply is 5 V.
This circuit using only transistors was obtained from Ferranti's 1969 documentation. It can be...
This sensitive circuit can be designed with FETs such as BF245 and MPF102. The sensor is a silicon...
Found in Popular Electronics from the 90s, this circuit generates two tones that are selected by a...