This circuit allows you to read resistors up to 20 M ohms, converting it into voltage. The circuit is from the 90s. The operational ones used admit modern equivalents.
This power supply was found in the September 1989 issue of Radio Electronics magazine. The 2N3055...
I found this simple circuit from an English magazine from 1984. The circuit can be easily...
This voltage regulator for automotive use was found in a Radio Electronics from the 80s. The Q3...