This amplifier for instrumentation with very high input impedance was found in a manual of JFET circuits. The operational ones used are current and the power supply must be symmetrical.
We found this circuit in the La Radio per Tutti magazine in Italy in 1926. The coil can be made...
Other series amplifiers such as the MC3301, MC3401 and LM2900 can be used on this circuit. We found...
Using a Norton operational amplifier circuit, we have in the figure a variable voltage regulator. The...