It couldn’t be easier however you have to admit that a little adjustable portable power supply such as this one will be truly handy.
The primary part of the PSU is an LM317 linear voltage regulator which we’re already familiar with. The output voltage is adjustable based on a voltage divider between two of the pins. The set of eight DIP switches enables you to modify that voltage divider. switch number one links the 9-volt battery connector to the regulator, serving as a power switch. Each of the other seven switches adjusts the output voltage by 1.5 volts. The output of the regulator links to your target gadget utilizing alligator clips which are not in frame above.
[Jason] states he takes this with him when thrift store hunting for affordable electronics. It can mimic most combinations of Alkaline cells letting you power up electronic toys to ensure they work. however we would discover it similarly useful for getting that early prototype away from the bench supply for testing before finalizing a devoted portable supply.