We found this circuit in a Poptronics from the 90's. Equivalent operational amplifiers can be used. The circuit must be supplied by a symmetrical source.
We found this circuit in documentation from Ferranti from 1968. The circuit uses transistors from that...
This circuit was found in a 1968’s publication and uses germanium transistors. The characteristic...
The values of the components in this experimental circuit are those of the previous circuit. The...