This simple bridge circuit can be used for impedance or resistance measurement using a high impedance earphone as an indicator. The circuit is from an American 80's documentation.
We can obtain the characteristics of an operational amplifier with FET by adding FETs common to the...
We found this circuit in an old English documentation. The JFET can be any general purpose and the...
This circuit is from 1995 documentation, with Q1 and Q2 of type 2N2218 or higher power. L1 has 3 + 3...