Sparky Projects | (tips) Variable Voltage Regulator @sparkyprojects | Uploaded March 2016 | Updated October 2024, 1 day ago.
If you need to have a supply of maybe 7v, but all you have are 5v or 6v fixed regulators, here's a simple way of modifying the voltage using diodes
Also covered in my website sparky-projects.co.uk/regulators.html