“Having made a couple of home-made batteries which only produced about 1 volts each, I realised that it would be useful to be able to increase this voltage to power a LED light. You may be thinking ‘connect 2 in series’ but there are disadvantages with this.
This voltage booster increases the voltage. It has leads with alligator clips, so it can be used on different projects.
It is simple and cheap to make.”