Using LTC1070 circuit manufactured by Linear Technology can be designed a 6-12 volt DC DC converter, using fewer electronic components. This 6-12 volts converter may provide a maximum current of maxim2A.
Circuit works on the flyback principle, which end is equipped with electronic power switch, IC1 working at a frequency of 40 kHz. At each actuation of the switch, energy is stored in inductor L1 and capacitor C3 then transferred by D11.
Using several discrete electronic components can be designed a very simple DC DC converter which converts a positive voltage of 5 volts to a negative voltage of 15 volts. The negative voltage converter is different than most other similar circuits.
A variable voltage "Zener" can be done using this electronic scheme. Compared to Zener diodes normal input impedance is higher (20 ... 50 ohms), lower peak load and temperature coefficient of only about -2 mV / ° C. However, the circuit is quite simple and use can be modified in the field of 3 ... 25 V. Once the voltage of T1 is greater than 0.6 V, the transistor leads, therefore, lead and voltage T2 can not grow, like a Zener diode. R2 sets the ratio between P1/R2 and Zener voltage of the circuit.