I'm building variable voltage regulator, the regulator has levels of 9, 12, 15 and 18 volts and a potentiometer that allows for incremental adjustment between the levels, so at level 18v you can drop down close to 15V.
My circuit works fine when testing, but I need to connect it to a load resistor. I've been using a 5k potentiometer and varying the resistance to make sure the voltage stays steady, which it does.
However without a load resistor the voltage regulation does not work, which brings up a question.
Do I need to implement a load resistor in the actual design?
The device I'm building will be used as a power supply for guitar effect pedals, which usually have a current output of 10mA to 450mA, so the device should work fine when connected to a pedal.
But my device also has to pass a test, so how do I check the voltage output when a load isn't attached?
Here is the data sheet for the chip I'm using and below is my schematic in three pictures to make it easier to see.
All the pins starting with an "S" will go to a dp4t switch and the pins starting with a "P" will go to a potentiometer.