This circuit was found in Mullard's transistor application manual from 1960. More modern transistors can be used. The zener diodes used have the indicated voltages.
This circuit is part of a synthesizer that was published in parts in several issues of Radio...
This symmetrical or dual source without regulation is indicated for the feeding of experimental projects...
Integrated LM108 and LM101A are used in this fast adder with low input current, figure. The...