A very simple dual 15 volt power supply circuit electronic project can be designed using the LT3511 high voltage monolithic switching regulator specifically designed for the isolated flyback topology.
This 15 volt switching power supply electronic circuit require few electronic parts and .
The LT3511 operates from an input voltage range of 4.5V to 100V and delivers up to 2.5W of isolated output power , but the input voltage required by this power supply circuit is from 20 volt and up to 30 volt DC .
Two external resistors and the transformer turns ratio easily set the output voltage.
This DC DC converter power supply circuit will provide a maximum output current of 90mA , so this circuit can be used in electronic circuits that will require a very low power .