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.
This circuit was obtained from an English magazine from 1979, but can be easily assembled...
We found this circuit in a 1991 European documentation. The circuit shows how to use the LM3900...
Found in a General Electric documentation from the 1980s, this circuit makes use of a FET...