This circuit is suggested by National Semiconductor in its Linear Applications Handbook. The LM3909 integrated circuit consists of a very low consumption oscillator with a power supply of 1.2 V.
The circuit of the figure can provide voltages of 5, 8.9 and 12.5 V at its output, all doing this...
In the figure we have an application of ON Semiconductor's own semiconductor manual from the 80's....
This circuit was found in Philips documentation from 1969. The components are from the time...