This conventional high voltage tripler circuit uses high voltage diodes to obtain voltages on the order of thousands of volts depending on the input.
An interesting timer is shown in the figure, using one of the 4 NAND gates of the integrated 4001....
General Electric suggests this circuit in a 1980s documentation. The operational of the time is...
This simple adjustable source uses a PNP transistor that can be the BD136 for even slightly higher...