This is a cheap DC Voltage Doubler Circuit diagram, which requires a few components and will deliver 10V from a 5V power supply. If the oscillator must be built from a non-functional gate then is required 2 more components: R1 and C3.
The most important parameters of this voltage doubler circuit are given in the table below. Note that because of the IC tolerances these data may have some differences.
Voltage doubler circuit diagram