This circuit was obtained from a 1977 FET manual. The circuit measures inductances using a signal generator as a reference. The range is from 60 uH to 60 000 H. The FET can be a BF245.
This short-range FM transceiver uses a headset to listen. We found the circuit in a Japanese...
The CMOS 4046 integrated circuit is seldom used, both due to the difficulty of finding it and the...
We found this circuit in the 1982 Selezione Radio magazine in Italy. The circuit uses an...