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.
Found in the July 1968 Supertena Bulletin of a Popular Electronics, this receiver makes use of the...
This switching source was obtained in a 1976 National Semiconductor manual. For the indicated...
This configuration appears several times on this site. The circuit can generate a 100 kHz or other...