This circuit was found in Intersil's documentation from the 70's, being indicated for powering operational amplifiers. The circuit divides the voltage from a single source.
This circuit was found in a 1967 Raytheon manual. The transistors are from the time. Equivalent modern...
This circuit was published in a 1979 magazine, but it can still be easily assembled as the...
The circuit presented generates short pulses. This configuration was found in a publication from...