This circuit was found in a 1967 US documentation. The circuit applies to modern general purpose transistors. The circuit has no offset. The power supply must be symmetrical.
In the figure we have the way to obtain 500 gain from a FET. FETs can be BF245 or MPF102. The...
With the circuit shown in the figure, we have a logic signal to activate a calling device when...
Found in 1980s Electronics Design, this circuit covers 4 decades of frequencies with a unique...