We found this circuit at Popular Electronics. The components are still current. Changes can be made to obtain higher voltages, as indicated in the second diagram.
The circuit shown is from Motorola's 1990 Linear Databook. Shaded components are optional. The...
This circuit was published in an English magazine from 1972, but it can be easily implemented...
This circuit was obtained from an English magazine from 1977. The magazine no longer exists, but...