The circuit shown is from 1994 National Semiconductor documentation but can be implemented with more modern operational amplifiers. The power supply must be symmetrical.
L1 is formed by 80 turns of wire 28 in a ferrite rod to tune medium waves range. The circuit can...
We found this circuit in an old practical publication. The circuit is still viable today and the...
This circuit was obtained from a 1977 FET manual. The circuit measures inductances using a signal...