Using the ISL6185 USB power controller family can be designed a very simple USB power supply electronic project that provides fully independent overcurrent (OC) fault protection for two or more USB ports.
Using the FAN7710 Ballast Control IC for Compact Fluorescent Lamps developed using Fairchild’s unique highvoltage process and system-in-package (SiP) concept can be designed a very simple low cost fluorescent lamp driver electronic project .
A very simple variable power supply circuit can be made using this electronic circuit diagram .This variable regulator circuit will provide an variable regulated output voltage , between 0 and 50 volts . The CA3140 operational amplifier compares the regulator output to a reference voltage , that depends on the R9 value . The output voltage will be nominally twice the voltage between the positive input ( noninverting ) of the CA3140 and ground . The unregulated input voltage must be around 60 volts .
The output voltage can be set between 0 an 50 volts using R9 potentiometer .
