In the circuit I am working on there is a requirement to create 30V DC source for a very light load (couple of mA max). I am aware that there a specialized ICs that can do that but I would like to achieve that with the parts that I already have.
What I came up with is this: The idea is that 555 IC configured in astable mode drives a voltage multipler (configured as tripler on the schematic), a fraction of output voltage is compared with known source (1/3rd of 15V) via an op amp and the amplified error is fed into NPN so that when base voltage is ~0 control and reset pins of 555 IC are triggered.
What I was wondering is:
- Is there any reason this circuit would fail in the real life?
- Are there any possible improvements that might simplify/improve the schematic?