This symmetrical four voltage source was found in a 1968 Motorola documentation. The circuit is of a type that was commonly used in that time amplifiers.
This circuit was found in a European documentation from 1964. The circuit makes use of components of...
We found this circuit in the Linear Applications Handbook of the National Semiconductor of 1994....
This interesting circuit, found in a European publication from the 90s, has two control channels for...