A lot of people look for linear power supplies that will run projects from 1.8 volts to 24 volts with higher currents. It is easy to use off the shelf linear regulators, but when the voltage range is so high the power dissipation in the regulator leads to disappointing results as all the power between the lower voltages and the bulk power supply are dissipated in the regulator. So even with a huge heatsink these regulators can't supply much current at the low voltages. For example a 3 amp...