Found in American documentation from the 90's, this JFET stage has an input impedance of 500 M ohms. Bipolar transistors are general purpose types and the FET supports an equivalent.
This circuit was found in a 2005 Linear Technology manual. The circuit monitors 12 V batteries in...
This circuit of a few tens of milliwatts of power requires a single source. We found it in a Radio...
The circuit in the figure is a current regulator with adjustment in the range of 0 to 3 amps. The...