This circuit was found in ancient American documentation. Equivalent operational amplifiers can be used. The power supply must be symmetrical. The circuit provides an average output.
This circuit was found in a 1964 Electronic Design. The transistors are of the time, but can be...
The values of the components of this Mullard (Philips) circuit depend on the desired voltages. The...
This amplifier, found in a 1980s documentation, should be powered by a symmetrical source. Modern...